diff --git a/internal/cli/catalog.go b/internal/cli/catalog.go
index dbaf6c7..197e573 100644
--- a/internal/cli/catalog.go
+++ b/internal/cli/catalog.go
@@ -21,15 +21,16 @@ type productionComponents struct {
 
 func newProductionComponents() (productionComponents, error) {
 	registries := pipeline.Registries{
-		Inputs:          pipeline.NewInputAdapterRegistry(),
-		Chunkers:        pipeline.NewChunkerRegistry(),
-		ArtifactCodecs:  pipeline.NewArtifactCodecRegistry(),
-		Extractors:      pipeline.NewExtractorRegistry(),
-		Mergers:         pipeline.NewMergerRegistry(),
-		Normalizers:     pipeline.NewNormalizerRegistry(),
-		Validators:      pipeline.NewValidatorRegistry(),
-		ValidatorChains: pipeline.NewValidatorChainRegistry(),
-		Outputs:         pipeline.NewOutputEncoderRegistry(),
+		Inputs:           pipeline.NewInputAdapterRegistry(),
+		Chunkers:         pipeline.NewChunkerRegistry(),
+		ArtifactCodecs:   pipeline.NewArtifactCodecRegistry(),
+		ArtifactEvidence: pipeline.NewArtifactEvidenceRegistry(),
+		Extractors:       pipeline.NewExtractorRegistry(),
+		Mergers:          pipeline.NewMergerRegistry(),
+		Normalizers:      pipeline.NewNormalizerRegistry(),
+		Validators:       pipeline.NewValidatorRegistry(),
+		ValidatorChains:  pipeline.NewValidatorChainRegistry(),
+		Outputs:          pipeline.NewOutputEncoderRegistry(),
 	}
 	assets := llm.NewAssetRegistry()
 	registrars := []struct {
@@ -88,29 +89,31 @@ func effectiveRegistries(opts Options) (pipeline.Registries, error) {
 
 func catalogFromRegistries(registries pipeline.Registries) pipeline.ModuleCatalog {
 	return pipeline.ModuleCatalog{
-		Inputs:          registries.Inputs,
-		Chunkers:        registries.Chunkers,
-		ArtifactCodecs:  registries.ArtifactCodecs,
-		Extractors:      registries.Extractors,
-		Mergers:         registries.Mergers,
-		Normalizers:     registries.Normalizers,
-		Validators:      registries.Validators,
-		ValidatorChains: registries.ValidatorChains,
-		Outputs:         registries.Outputs,
+		Inputs:           registries.Inputs,
+		Chunkers:         registries.Chunkers,
+		ArtifactCodecs:   registries.ArtifactCodecs,
+		ArtifactEvidence: registries.ArtifactEvidence,
+		Extractors:       registries.Extractors,
+		Mergers:          registries.Mergers,
+		Normalizers:      registries.Normalizers,
+		Validators:       registries.Validators,
+		ValidatorChains:  registries.ValidatorChains,
+		Outputs:          registries.Outputs,
 	}
 }
 
 func registriesFromCatalog(catalog pipeline.ModuleCatalog) pipeline.Registries {
 	return pipeline.Registries{
-		Inputs:          catalog.Inputs,
-		Chunkers:        catalog.Chunkers,
-		ArtifactCodecs:  catalog.ArtifactCodecs,
-		Extractors:      catalog.Extractors,
-		Mergers:         catalog.Mergers,
-		Normalizers:     catalog.Normalizers,
-		Validators:      catalog.Validators,
-		ValidatorChains: catalog.ValidatorChains,
-		Outputs:         catalog.Outputs,
+		Inputs:           catalog.Inputs,
+		Chunkers:         catalog.Chunkers,
+		ArtifactCodecs:   catalog.ArtifactCodecs,
+		ArtifactEvidence: catalog.ArtifactEvidence,
+		Extractors:       catalog.Extractors,
+		Mergers:          catalog.Mergers,
+		Normalizers:      catalog.Normalizers,
+		Validators:       catalog.Validators,
+		ValidatorChains:  catalog.ValidatorChains,
+		Outputs:          catalog.Outputs,
 	}
 }
 
@@ -118,6 +121,7 @@ func isEmptyCatalog(catalog pipeline.ModuleCatalog) bool {
 	return catalog.Inputs == nil &&
 		catalog.Chunkers == nil &&
 		catalog.ArtifactCodecs == nil &&
+		catalog.ArtifactEvidence == nil &&
 		catalog.Extractors == nil &&
 		catalog.Mergers == nil &&
 		catalog.Normalizers == nil &&
@@ -130,6 +134,7 @@ func isEmptyRegistries(registries pipeline.Registries) bool {
 	return registries.Inputs == nil &&
 		registries.Chunkers == nil &&
 		registries.ArtifactCodecs == nil &&
+		registries.ArtifactEvidence == nil &&
 		registries.Extractors == nil &&
 		registries.Mergers == nil &&
 		registries.Normalizers == nil &&
diff --git a/internal/cli/production_contract_test.go b/internal/cli/production_contract_test.go
index 96c86ba..2b25661 100644
--- a/internal/cli/production_contract_test.go
+++ b/internal/cli/production_contract_test.go
@@ -161,8 +161,8 @@ func TestProductionCatalogCoversMaintainedConfigurations(t *testing.T) {
 
 	catalog := catalogFromRegistries(registries)
 	converted := registriesFromCatalog(catalog)
-	if converted.ArtifactCodecs != registries.ArtifactCodecs || converted.ValidatorChains != registries.ValidatorChains {
-		t.Fatal("catalog/registry conversion did not preserve codec and validator-chain registries")
+	if converted.ArtifactCodecs != registries.ArtifactCodecs || converted.ArtifactEvidence != registries.ArtifactEvidence || converted.ValidatorChains != registries.ValidatorChains {
+		t.Fatal("catalog/registry conversion did not preserve artifact and validator registries")
 	}
 	codecSpec, ok := catalog.ArtifactCodecs.Spec(dnd.SpellListKind)
 	if !ok || codecSpec.Kind != dnd.SpellListKind || codecSpec.Schema.ID != spellcodec.SchemaID {
diff --git a/internal/framework/pipeline/artifact_evidence_registry.go b/internal/framework/pipeline/artifact_evidence_registry.go
new file mode 100644
index 0000000..aefe9da
--- /dev/null
+++ b/internal/framework/pipeline/artifact_evidence_registry.go
@@ -0,0 +1,148 @@
+package pipeline
+
+import (
+	"fmt"
+	"reflect"
+	"sort"
+	"strings"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
+)
+
+// ArtifactEvidenceProjector returns the direct source references represented
+// by one normalized artifact value.
+type ArtifactEvidenceProjector[T any] func(T) []source.SourceRef
+
+// ArtifactEvidenceRegistry keeps the typed projection boundary private while
+// allowing preparation and execution to discover registered capabilities.
+type ArtifactEvidenceRegistry struct {
+	entries map[contracts.ArtifactKind]artifactEvidenceEntry
+}
+
+type artifactEvidenceEntry struct {
+	valueType reflect.Type
+	project   func(any) ([]source.SourceRef, error)
+}
+
+func NewArtifactEvidenceRegistry() *ArtifactEvidenceRegistry {
+	return &ArtifactEvidenceRegistry{entries: make(map[contracts.ArtifactKind]artifactEvidenceEntry)}
+}
+
+// RegisterArtifactEvidence registers one evidence projector for an artifact
+// kind. Projectors are invoked only after an exact Go-type check.
+func RegisterArtifactEvidence[T any](registry *ArtifactEvidenceRegistry, kind contracts.ArtifactKind, projector ArtifactEvidenceProjector[T]) error {
+	if registry == nil {
+		return fmt.Errorf("artifact evidence registry must not be nil")
+	}
+	if projector == nil {
+		return fmt.Errorf("artifact evidence projector must not be nil")
+	}
+	kind = normalizeArtifactKind(kind)
+	if kind == "" {
+		return fmt.Errorf("artifact evidence kind must not be empty")
+	}
+	if _, ok := registry.entries[kind]; ok {
+		return fmt.Errorf("artifact evidence %q is already registered", kind)
+	}
+	valueType := reflect.TypeFor[T]()
+	if registry.entries == nil {
+		registry.entries = make(map[contracts.ArtifactKind]artifactEvidenceEntry)
+	}
+	registry.entries[kind] = artifactEvidenceEntry{
+		valueType: valueType,
+		project: func(value any) ([]source.SourceRef, error) {
+			actualType := reflect.TypeOf(value)
+			if actualType != valueType {
+				return nil, newArtifactEvidenceTypeError(kind, valueType, actualType)
+			}
+			typed, ok := value.(T)
+			if !ok {
+				return nil, newArtifactEvidenceTypeError(kind, valueType, actualType)
+			}
+			return append([]source.SourceRef(nil), projector(typed)...), nil
+		},
+	}
+	return nil
+}
+
+func (r *ArtifactEvidenceRegistry) RegisteredKinds() []contracts.ArtifactKind {
+	if r == nil || len(r.entries) == 0 {
+		return nil
+	}
+	kinds := make([]contracts.ArtifactKind, 0, len(r.entries))
+	for kind := range r.entries {
+		kinds = append(kinds, kind)
+	}
+	sort.Slice(kinds, func(i, j int) bool { return kinds[i] < kinds[j] })
+	return kinds
+}
+
+// Project returns independently owned direct references for a registered
+// artifact value.
+func (r *ArtifactEvidenceRegistry) Project(kind contracts.ArtifactKind, value any) ([]source.SourceRef, error) {
+	entry, normalizedKind, err := r.entry(kind)
+	if err != nil {
+		return nil, err
+	}
+	refs, err := entry.project(value)
+	if err != nil {
+		return nil, fmt.Errorf("project artifact evidence %q: %w", normalizedKind, err)
+	}
+	return append([]source.SourceRef(nil), refs...), nil
+}
+
+func (r *ArtifactEvidenceRegistry) entry(kind contracts.ArtifactKind) (artifactEvidenceEntry, contracts.ArtifactKind, error) {
+	if r == nil {
+		return artifactEvidenceEntry{}, "", fmt.Errorf("artifact evidence registry must not be nil")
+	}
+	kind = normalizeArtifactKind(kind)
+	if kind == "" {
+		return artifactEvidenceEntry{}, "", fmt.Errorf("artifact evidence kind must not be empty")
+	}
+	entry, ok := r.entries[kind]
+	if !ok {
+		return artifactEvidenceEntry{}, kind, fmt.Errorf("artifact evidence %q is not registered", kind)
+	}
+	return entry, kind, nil
+}
+
+func (r *ArtifactEvidenceRegistry) valueType(kind contracts.ArtifactKind) (reflect.Type, bool) {
+	if r == nil {
+		return nil, false
+	}
+	entry, ok := r.entries[normalizeArtifactKind(kind)]
+	if !ok {
+		return nil, false
+	}
+	return entry.valueType, true
+}
+
+func newArtifactEvidenceTypeError(kind contracts.ArtifactKind, expected, actual reflect.Type) error {
+	actualName := "<nil>"
+	if actual != nil {
+		actualName = actual.String()
+	}
+	return fmt.Errorf("project artifact evidence %q: expected exact Go type %s, got %s", kind, expected, actualName)
+}
+
+func normalizeEvidenceLaneIDs(values []string) ([]string, error) {
+	if len(values) == 0 {
+		return nil, fmt.Errorf("evidence lane ids must not be empty")
+	}
+	seen := make(map[string]struct{}, len(values))
+	lanes := make([]string, 0, len(values))
+	for _, raw := range values {
+		lane := strings.TrimSpace(raw)
+		if lane == "" {
+			return nil, fmt.Errorf("evidence lane id must not be empty")
+		}
+		if _, ok := seen[lane]; ok {
+			return nil, fmt.Errorf("evidence lane id %q is duplicated", lane)
+		}
+		seen[lane] = struct{}{}
+		lanes = append(lanes, lane)
+	}
+	sort.Strings(lanes)
+	return lanes, nil
+}
diff --git a/internal/framework/pipeline/artifact_evidence_registry_test.go b/internal/framework/pipeline/artifact_evidence_registry_test.go
new file mode 100644
index 0000000..b3e9c95
--- /dev/null
+++ b/internal/framework/pipeline/artifact_evidence_registry_test.go
@@ -0,0 +1,55 @@
+package pipeline
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
+)
+
+func TestArtifactEvidenceRegistryProjectsExactRegisteredTypesWithOwnedReferences(t *testing.T) {
+	registry := NewArtifactEvidenceRegistry()
+	input := codecNotes{Items: []string{"one"}}
+	refs := []source.SourceRef{{SourceID: "source", StartUnitID: 2, EndUnitID: 2}}
+	if err := RegisterArtifactEvidence(registry, "test/notes", func(codecNotes) []source.SourceRef { return refs }); err != nil {
+		t.Fatalf("RegisterArtifactEvidence() error = %v, want nil", err)
+	}
+	if err := RegisterArtifactEvidence(registry, "test/score", func(codecScore) []source.SourceRef { return nil }); err != nil {
+		t.Fatalf("RegisterArtifactEvidence() second kind error = %v, want nil", err)
+	}
+	if got, want := registry.RegisteredKinds(), []contracts.ArtifactKind{"test/notes", "test/score"}; !reflect.DeepEqual(got, want) {
+		t.Fatalf("RegisteredKinds() = %#v, want %#v", got, want)
+	}
+	projected, err := registry.Project(" test/notes ", input)
+	if err != nil {
+		t.Fatalf("Project() error = %v, want nil", err)
+	}
+	projected[0].StartUnitID = 99
+	if refs[0].StartUnitID != 2 {
+		t.Fatal("Project() retained projector reference storage")
+	}
+	if _, err := registry.Project("test/notes", codecNotesAlias(input)); err == nil || !strings.Contains(err.Error(), "expected exact Go type") {
+		t.Fatalf("Project() exact type error = %v, want exact type failure", err)
+	}
+}
+
+func TestArtifactEvidenceRegistryRejectsInvalidRegistration(t *testing.T) {
+	registry := NewArtifactEvidenceRegistry()
+	if err := RegisterArtifactEvidence[codecNotes](nil, "test/notes", func(codecNotes) []source.SourceRef { return nil }); err == nil || !strings.Contains(err.Error(), "must not be nil") {
+		t.Fatalf("nil registry error = %v, want failure", err)
+	}
+	if err := RegisterArtifactEvidence(registry, " ", func(codecNotes) []source.SourceRef { return nil }); err == nil || !strings.Contains(err.Error(), "must not be empty") {
+		t.Fatalf("blank kind error = %v, want failure", err)
+	}
+	if err := RegisterArtifactEvidence(registry, "test/notes", ArtifactEvidenceProjector[codecNotes](nil)); err == nil || !strings.Contains(err.Error(), "must not be nil") {
+		t.Fatalf("nil projector error = %v, want failure", err)
+	}
+	if err := RegisterArtifactEvidence(registry, "test/notes", func(codecNotes) []source.SourceRef { return nil }); err != nil {
+		t.Fatal(err)
+	}
+	if err := RegisterArtifactEvidence(registry, "test/notes", func(codecNotes) []source.SourceRef { return nil }); err == nil || !strings.Contains(err.Error(), "already registered") {
+		t.Fatalf("duplicate kind error = %v, want failure", err)
+	}
+}
diff --git a/internal/framework/pipeline/evidence_policy.go b/internal/framework/pipeline/evidence_policy.go
new file mode 100644
index 0000000..5171276
--- /dev/null
+++ b/internal/framework/pipeline/evidence_policy.go
@@ -0,0 +1,20 @@
+package pipeline
+
+// EvidenceContextPolicy controls optional source-context publication by an
+// output encoder.
+type EvidenceContextPolicy struct {
+	Enabled     bool
+	WindowUnits int
+	LaneIDs     []string
+}
+
+// EvidenceContextPolicyProvider is implemented by output encoders that opt in
+// to evidence-context publication.
+type EvidenceContextPolicyProvider interface {
+	EvidenceContextPolicy() EvidenceContextPolicy
+}
+
+func cloneEvidenceContextPolicy(policy EvidenceContextPolicy) EvidenceContextPolicy {
+	policy.LaneIDs = append([]string(nil), policy.LaneIDs...)
+	return policy
+}
diff --git a/internal/framework/pipeline/evidence_preparation_test.go b/internal/framework/pipeline/evidence_preparation_test.go
new file mode 100644
index 0000000..8a5f7a7
--- /dev/null
+++ b/internal/framework/pipeline/evidence_preparation_test.go
@@ -0,0 +1,98 @@
+package pipeline
+
+import (
+	"context"
+	"reflect"
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
+)
+
+type testEvidenceOutput struct {
+	policy EvidenceContextPolicy
+}
+
+func (output testEvidenceOutput) Key() string { return "output" }
+func (output testEvidenceOutput) Encode(context.Context, contracts.OutputRequest) (contracts.OutputResult, error) {
+	return contracts.OutputResult{}, nil
+}
+func (output testEvidenceOutput) EvidenceContextPolicy() EvidenceContextPolicy {
+	return cloneEvidenceContextPolicy(output.policy)
+}
+
+func TestPrepareEvidencePlanSelectsActiveLanesAndOwnsPolicy(t *testing.T) {
+	registries, _ := constructionRegistries(t, nil, nil)
+	registries.ArtifactEvidence = NewArtifactEvidenceRegistry()
+	registerTestEvidenceOutput(t, &registries, EvidenceContextPolicy{Enabled: true, WindowUnits: 2, LaneIDs: []string{"artifact", "inactive"}})
+	if err := RegisterArtifactEvidence(registries.ArtifactEvidence, "test/notes", func(codecNotes) []source.SourceRef { return nil }); err != nil {
+		t.Fatal(err)
+	}
+	profile := constructionProfile()
+	profile.Output.Options = map[string]any{"known": true}
+	resolved, err := ResolvePipeline(profile, ResolveOptions{}, registries.catalog())
+	if err != nil {
+		t.Fatal(err)
+	}
+	prepared, err := Prepare(resolved, registries, ModuleDependencies{})
+	if err != nil {
+		t.Fatalf("Prepare() error = %v, want nil", err)
+	}
+	if prepared.evidencePlan == nil || !reflect.DeepEqual(prepared.evidencePlan.policy.LaneIDs, []string{"artifact", "inactive"}) {
+		t.Fatalf("evidence plan = %#v, want complete configured policy", prepared.evidencePlan)
+	}
+	if got := prepared.evidencePlan.lanes; len(got) != 1 || got[0].laneID != "artifact" {
+		t.Fatalf("active evidence lanes = %#v, want artifact only", got)
+	}
+	prepared.evidencePlan.policy.LaneIDs[0] = "mutated"
+	if policy := prepared.output.(EvidenceContextPolicyProvider).EvidenceContextPolicy(); policy.LaneIDs[0] != "artifact" {
+		t.Fatalf("prepared plan mutated provider policy: %#v", policy)
+	}
+}
+
+func TestPrepareEvidencePlanRejectsMissingAndMismatchedCapabilities(t *testing.T) {
+	for _, test := range []struct {
+		name      string
+		configure func(*Registries)
+		want      string
+	}{
+		{name: "missing registry", configure: func(registries *Registries) { registries.ArtifactEvidence = nil }, want: "artifact evidence registry"},
+		{name: "unsupported kind", configure: func(registries *Registries) {}, want: "artifact evidence \"test/notes\" is not registered"},
+		{name: "mismatched type", configure: func(registries *Registries) {
+			if err := RegisterArtifactEvidence(registries.ArtifactEvidence, "test/notes", func(codecScore) []source.SourceRef { return nil }); err != nil {
+				t.Fatal(err)
+			}
+		}, want: "requires Go type"},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			registries, _ := constructionRegistries(t, nil, nil)
+			registries.ArtifactEvidence = NewArtifactEvidenceRegistry()
+			registerTestEvidenceOutput(t, &registries, EvidenceContextPolicy{Enabled: true, LaneIDs: []string{"artifact"}})
+			test.configure(&registries)
+			profile := constructionProfile()
+			profile.Output.Options = map[string]any{"known": true}
+			resolved, err := ResolvePipeline(profile, ResolveOptions{}, registries.catalog())
+			if err != nil {
+				t.Fatal(err)
+			}
+			_, err = Prepare(resolved, registries, ModuleDependencies{})
+			if err == nil || !strings.Contains(err.Error(), test.want) {
+				t.Fatalf("Prepare() error = %v, want %q", err, test.want)
+			}
+		})
+	}
+}
+
+func registerTestEvidenceOutput(t *testing.T, registries *Registries, policy EvidenceContextPolicy) {
+	t.Helper()
+	registry := NewOutputEncoderRegistry()
+	if err := registry.RegisterBuilderWithSpec(defaultModuleSpec("output", StageOutput), func(options map[string]any) error {
+		return RejectUnknownOptions(options, "known")
+	}, func(BuildRequest) (contracts.OutputEncoder, error) {
+		return testEvidenceOutput{policy: cloneEvidenceContextPolicy(policy)}, nil
+	}); err != nil {
+		t.Fatal(err)
+	}
+	registries.Outputs = registry
+}
diff --git a/internal/framework/pipeline/options.go b/internal/framework/pipeline/options.go
index a567ef0..7fa5f0e 100644
--- a/internal/framework/pipeline/options.go
+++ b/internal/framework/pipeline/options.go
@@ -2,7 +2,7 @@ package pipeline
 
 import "fmt"
 
-func validateResolvedOptions(resolved ResolvedPipeline, catalog ModuleCatalog) error {
+func validateResolvedOptions(resolved ResolvedPipeline, catalog ModuleCatalog, configuredLaneIDs []string) error {
 	if err := catalog.Inputs.ValidateOptions(resolved.Input.Module, resolved.Input.Options); err != nil {
 		return moduleOptionsError(resolved.ID, "", StageInput, resolved.Input.Module, err)
 	}
@@ -42,6 +42,9 @@ func validateResolvedOptions(resolved ResolvedPipeline, catalog ModuleCatalog) e
 	if err := catalog.Outputs.ValidateOptions(resolved.Output.Module, resolved.Output.Options); err != nil {
 		return moduleOptionsError(resolved.ID, "", StageOutput, resolved.Output.Module, err)
 	}
+	if err := catalog.Outputs.ValidateProfileOptions(resolved.Output.Module, OutputProfileOptionContext{LaneIDs: configuredLaneIDs}, resolved.Output.Options); err != nil {
+		return moduleOptionsError(resolved.ID, "", StageOutput, resolved.Output.Module, err)
+	}
 	return nil
 }
 
diff --git a/internal/framework/pipeline/output_registry.go b/internal/framework/pipeline/output_registry.go
index 5da88ee..1eb4529 100644
--- a/internal/framework/pipeline/output_registry.go
+++ b/internal/framework/pipeline/output_registry.go
@@ -10,17 +10,25 @@ import (
 type OutputEncoderConstructor func() (contracts.OutputEncoder, error)
 type OutputEncoderBuilder func(BuildRequest) (contracts.OutputEncoder, error)
 
+type OutputProfileOptionContext struct {
+	LaneIDs []string
+}
+
+type OutputProfileOptionValidator func(OutputProfileOptionContext, map[string]any) error
+
 type OutputEncoderRegistry struct {
-	builders         map[string]OutputEncoderBuilder
-	optionValidators map[string]OptionValidator
-	specs            map[string]ModuleSpec
+	builders          map[string]OutputEncoderBuilder
+	optionValidators  map[string]OptionValidator
+	profileValidators map[string]OutputProfileOptionValidator
+	specs             map[string]ModuleSpec
 }
 
 func NewOutputEncoderRegistry() *OutputEncoderRegistry {
 	return &OutputEncoderRegistry{
-		builders:         make(map[string]OutputEncoderBuilder),
-		optionValidators: make(map[string]OptionValidator),
-		specs:            make(map[string]ModuleSpec),
+		builders:          make(map[string]OutputEncoderBuilder),
+		optionValidators:  make(map[string]OptionValidator),
+		profileValidators: make(map[string]OutputProfileOptionValidator),
+		specs:             make(map[string]ModuleSpec),
 	}
 }
 
@@ -38,6 +46,12 @@ func (r *OutputEncoderRegistry) RegisterWithSpec(spec ModuleSpec, constructor Ou
 }
 
 func (r *OutputEncoderRegistry) RegisterBuilderWithSpec(spec ModuleSpec, validateOptions OptionValidator, builder OutputEncoderBuilder) error {
+	return r.RegisterBuilderWithProfileValidation(spec, validateOptions, nil, builder)
+}
+
+// RegisterBuilderWithProfileValidation registers an output builder with an
+// optional validator that can inspect all configured lane identities.
+func (r *OutputEncoderRegistry) RegisterBuilderWithProfileValidation(spec ModuleSpec, validateOptions OptionValidator, validateProfile OutputProfileOptionValidator, builder OutputEncoderBuilder) error {
 	if r == nil {
 		return fmt.Errorf("output encoder registry must not be nil")
 	}
@@ -62,11 +76,15 @@ func (r *OutputEncoderRegistry) RegisterBuilderWithSpec(spec ModuleSpec, validat
 	if r.optionValidators == nil {
 		r.optionValidators = make(map[string]OptionValidator)
 	}
+	if r.profileValidators == nil {
+		r.profileValidators = make(map[string]OutputProfileOptionValidator)
+	}
 	if r.specs == nil {
 		r.specs = make(map[string]ModuleSpec)
 	}
 	r.builders[normalizedSpec.Key] = builder
 	r.optionValidators[normalizedSpec.Key] = validateOptions
+	r.profileValidators[normalizedSpec.Key] = validateProfile
 	r.specs[normalizedSpec.Key] = cloneModuleSpec(normalizedSpec)
 	return nil
 }
@@ -116,6 +134,21 @@ func (r *OutputEncoderRegistry) ValidateOptions(key string, options map[string]a
 	return validateRegisteredOptions(validator, options)
 }
 
+func (r *OutputEncoderRegistry) ValidateProfileOptions(key string, context OutputProfileOptionContext, options map[string]any) error {
+	if r == nil {
+		return fmt.Errorf("output encoder registry must not be nil")
+	}
+	normalizedKey := strings.TrimSpace(key)
+	validator, ok := r.profileValidators[normalizedKey]
+	if !ok {
+		return fmt.Errorf("output encoder %q is not registered", normalizedKey)
+	}
+	if validator == nil {
+		return nil
+	}
+	return validator(OutputProfileOptionContext{LaneIDs: append([]string(nil), context.LaneIDs...)}, cloneOptions(options))
+}
+
 func (r *OutputEncoderRegistry) Spec(key string) (ModuleSpec, bool) {
 	if r == nil {
 		return ModuleSpec{}, false
diff --git a/internal/framework/pipeline/output_registry_test.go b/internal/framework/pipeline/output_registry_test.go
index a2fca67..533c652 100644
--- a/internal/framework/pipeline/output_registry_test.go
+++ b/internal/framework/pipeline/output_registry_test.go
@@ -1,6 +1,7 @@
 package pipeline
 
 import (
+	"reflect"
 	"testing"
 
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
@@ -56,3 +57,33 @@ func TestOutputEncoderRegistryBehavior(t *testing.T) {
 		},
 	})
 }
+
+func TestOutputProfileValidationReceivesOwnedOptionsAndLaneIDs(t *testing.T) {
+	registry := NewOutputEncoderRegistry()
+	if err := registry.RegisterBuilderWithProfileValidation(defaultModuleSpec("profile-output", StageOutput), func(options map[string]any) error {
+		options["nested"].(map[string]any)["value"] = "changed"
+		return nil
+	}, func(context OutputProfileOptionContext, options map[string]any) error {
+		context.LaneIDs[0] = "changed"
+		options["nested"].(map[string]any)["value"] = "changed-again"
+		return nil
+	}, func(BuildRequest) (contracts.OutputEncoder, error) {
+		return registryOutputEncoder{key: "profile-output"}, nil
+	}); err != nil {
+		t.Fatal(err)
+	}
+	options := map[string]any{"nested": map[string]any{"value": "original"}}
+	if err := registry.ValidateOptions("profile-output", options); err != nil {
+		t.Fatal(err)
+	}
+	context := OutputProfileOptionContext{LaneIDs: []string{"artifact"}}
+	if err := registry.ValidateProfileOptions("profile-output", context, options); err != nil {
+		t.Fatal(err)
+	}
+	if got := options["nested"].(map[string]any)["value"]; got != "original" {
+		t.Fatalf("options mutated by validator: %q", got)
+	}
+	if want := []string{"artifact"}; !reflect.DeepEqual(context.LaneIDs, want) {
+		t.Fatalf("lane ids mutated by validator: %#v, want %#v", context.LaneIDs, want)
+	}
+}
diff --git a/internal/framework/pipeline/prepare.go b/internal/framework/pipeline/prepare.go
index 1f74ecf..e8d4ce6 100644
--- a/internal/framework/pipeline/prepare.go
+++ b/internal/framework/pipeline/prepare.go
@@ -5,6 +5,7 @@ import (
 	"reflect"
 	"strings"
 
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 )
 
@@ -24,6 +25,7 @@ type PreparedPipeline struct {
 	chunkValidators        preparedValidatorChain
 	output                 contracts.OutputEncoder
 	artifactCodecs         *ArtifactCodecRegistry
+	evidencePlan           *preparedEvidencePlan
 	checkpointFingerprints []CheckpointFingerprint
 }
 
@@ -55,6 +57,17 @@ type preparedTypedLane struct {
 	codec      artifactCodecEntry
 }
 
+type preparedEvidencePlan struct {
+	policy EvidenceContextPolicy
+	lanes  []preparedEvidenceLane
+}
+
+type preparedEvidenceLane struct {
+	laneID  string
+	kind    contracts.ArtifactKind
+	project func(any) ([]source.SourceRef, error)
+}
+
 type preparedValidatorChain struct {
 	resolved   ResolvedValidatorChain
 	validators []preparedValidator
@@ -129,6 +142,10 @@ func Prepare(resolved ResolvedPipeline, registries Registries, deps ModuleDepend
 		return nil, constructionError(stable.ID, "", StageOutput, stable.Output.Module, "", err)
 	}
 	prepared.output = output
+	prepared.evidencePlan, err = prepareEvidencePlan(stable, registries, output)
+	if err != nil {
+		return nil, err
+	}
 	prepared.checkpointFingerprints, err = collectPreparedCheckpointFingerprints(prepared)
 	if err != nil {
 		return nil, err
@@ -136,6 +153,52 @@ func Prepare(resolved ResolvedPipeline, registries Registries, deps ModuleDepend
 	return prepared, nil
 }
 
+func prepareEvidencePlan(resolved ResolvedPipeline, registries Registries, output contracts.OutputEncoder) (*preparedEvidencePlan, error) {
+	provider, ok := output.(EvidenceContextPolicyProvider)
+	if !ok {
+		return nil, nil
+	}
+	policy := cloneEvidenceContextPolicy(provider.EvidenceContextPolicy())
+	if !policy.Enabled {
+		return nil, nil
+	}
+	if policy.WindowUnits < 0 {
+		return nil, constructionError(resolved.ID, "", StageOutput, resolved.Output.Module, "", fmt.Errorf("evidence window units must not be negative"))
+	}
+	lanes, err := normalizeEvidenceLaneIDs(policy.LaneIDs)
+	if err != nil {
+		return nil, constructionError(resolved.ID, "", StageOutput, resolved.Output.Module, "", err)
+	}
+	policy.LaneIDs = lanes
+	active := make(map[string]ResolvedArtifactLane)
+	for _, lane := range resolved.AllArtifactLanes() {
+		active[lane.ID] = lane
+	}
+	plan := &preparedEvidencePlan{policy: cloneEvidenceContextPolicy(policy)}
+	for _, laneID := range policy.LaneIDs {
+		lane, ok := active[laneID]
+		if !ok {
+			continue
+		}
+		if registries.ArtifactEvidence == nil {
+			return nil, constructionError(resolved.ID, laneID, StageOutput, resolved.Output.Module, "", fmt.Errorf("artifact evidence registry must not be nil for active evidence lane"))
+		}
+		evidence, _, evidenceErr := registries.ArtifactEvidence.entry(lane.ArtifactKind)
+		if evidenceErr != nil {
+			return nil, constructionError(resolved.ID, laneID, StageOutput, resolved.Output.Module, "", evidenceErr)
+		}
+		codecType, ok := registries.ArtifactCodecs.valueType(lane.ArtifactKind)
+		if !ok {
+			return nil, constructionError(resolved.ID, laneID, StageOutput, resolved.Output.Module, "", fmt.Errorf("artifact codec %q has no Go type", lane.ArtifactKind))
+		}
+		if evidence.valueType != codecType {
+			return nil, constructionError(resolved.ID, laneID, StageOutput, resolved.Output.Module, "", fmt.Errorf("artifact evidence kind %q requires Go type %s, but active artifact codec uses %s", lane.ArtifactKind, typeName(evidence.valueType), typeName(codecType)))
+		}
+		plan.lanes = append(plan.lanes, preparedEvidenceLane{laneID: laneID, kind: lane.ArtifactKind, project: evidence.project})
+	}
+	return plan, nil
+}
+
 func prepareLane(pipeline ResolvedPipeline, lane ResolvedArtifactLane, registries Registries, deps ModuleDependencies) (preparedLaneExecutor, error) {
 	executor := preparedLaneExecutor{resolved: cloneResolvedArtifactLane(lane)}
 	request := func(binding ModuleBinding, references contracts.ReferenceSet) BuildRequest {
@@ -303,7 +366,7 @@ func constructionError(pipelineID, laneID string, stage ModuleStage, moduleKey,
 
 func (registries Registries) catalog() ModuleCatalog {
 	return ModuleCatalog{
-		Inputs: registries.Inputs, Chunkers: registries.Chunkers, ArtifactCodecs: registries.ArtifactCodecs,
+		Inputs: registries.Inputs, Chunkers: registries.Chunkers, ArtifactCodecs: registries.ArtifactCodecs, ArtifactEvidence: registries.ArtifactEvidence,
 		Extractors: registries.Extractors, Mergers: registries.Mergers, Normalizers: registries.Normalizers,
 		Validators: registries.Validators, ValidatorChains: registries.ValidatorChains, Outputs: registries.Outputs,
 	}
diff --git a/internal/framework/pipeline/profile.go b/internal/framework/pipeline/profile.go
index ae94e06..e8c788d 100644
--- a/internal/framework/pipeline/profile.go
+++ b/internal/framework/pipeline/profile.go
@@ -213,15 +213,16 @@ func (resolved ResolvedPipeline) AllArtifactLanes() []ResolvedArtifactLane {
 }
 
 type ModuleCatalog struct {
-	Inputs          *InputAdapterRegistry
-	Chunkers        *ChunkerRegistry
-	ArtifactCodecs  *ArtifactCodecRegistry
-	Extractors      *ExtractorRegistry
-	Mergers         *MergerRegistry
-	Normalizers     *NormalizerRegistry
-	Validators      *ValidatorRegistry
-	ValidatorChains *ValidatorChainRegistry
-	Outputs         *OutputEncoderRegistry
+	Inputs           *InputAdapterRegistry
+	Chunkers         *ChunkerRegistry
+	ArtifactCodecs   *ArtifactCodecRegistry
+	ArtifactEvidence *ArtifactEvidenceRegistry
+	Extractors       *ExtractorRegistry
+	Mergers          *MergerRegistry
+	Normalizers      *NormalizerRegistry
+	Validators       *ValidatorRegistry
+	ValidatorChains  *ValidatorChainRegistry
+	Outputs          *OutputEncoderRegistry
 }
 
 func Binding(module string) ModuleBinding {
@@ -251,6 +252,10 @@ func ResolvePipeline(profile PipelineProfile, options ResolveOptions, catalog Mo
 	if len(steps) == 0 {
 		return ResolvedPipeline{}, fmt.Errorf("pipeline %q must declare at least one artifact lane", pipelineID)
 	}
+	configuredLaneIDs, err := configuredProfileLaneIDs(pipelineID, steps)
+	if err != nil {
+		return ResolvedPipeline{}, err
+	}
 
 	input := resolveBinding(profile.Input, "")
 	if input.Module == "" {
@@ -381,7 +386,7 @@ func ResolvePipeline(profile PipelineProfile, options ResolveOptions, catalog Mo
 	if missing, ok := outputCapabilities.missing(outputSpec.Requires); ok {
 		return ResolvedPipeline{}, capabilityError(pipelineID, "", StageOutput, resolved.Output.Module, missing)
 	}
-	if err := validateResolvedOptions(resolved, catalog); err != nil {
+	if err := validateResolvedOptions(resolved, catalog, configuredLaneIDs); err != nil {
 		return ResolvedPipeline{}, err
 	}
 
@@ -393,6 +398,29 @@ func ResolvePipeline(profile PipelineProfile, options ResolveOptions, catalog Mo
 	return resolved, nil
 }
 
+// configuredProfileLaneIDs validates the complete configured lane identity
+// set before invocation-level selection removes legacy-profile lanes.
+func configuredProfileLaneIDs(pipelineID string, steps []PipelineStepProfile) ([]string, error) {
+	seen := make(map[string]string)
+	var laneIDs []string
+	for _, step := range steps {
+		_, ids, err := selectedArtifactLanes(pipelineID, step.Artifacts, ResolveOptions{})
+		if err != nil {
+			return nil, err
+		}
+		stepID := strings.TrimSpace(step.ID)
+		for _, laneID := range ids {
+			if previous, ok := seen[laneID]; ok {
+				return nil, fmt.Errorf("pipeline %q artifact lane id %q is duplicated across steps %q and %q", pipelineID, laneID, previous, stepID)
+			}
+			seen[laneID] = stepID
+			laneIDs = append(laneIDs, laneID)
+		}
+	}
+	sort.Strings(laneIDs)
+	return laneIDs, nil
+}
+
 func resolveArtifactLane(
 	pipelineID string,
 	stepID string,
@@ -1190,11 +1218,32 @@ func cloneOptions(options map[string]any) map[string]any {
 
 	copied := make(map[string]any, len(options))
 	for key, value := range options {
-		copied[key] = value
+		copied[key] = cloneOptionValue(value)
 	}
 	return copied
 }
 
+func cloneOptionValue(value any) any {
+	switch typed := value.(type) {
+	case map[string]any:
+		return cloneOptions(typed)
+	case []any:
+		out := make([]any, len(typed))
+		for i := range typed {
+			out[i] = cloneOptionValue(typed[i])
+		}
+		return out
+	case []string:
+		return append([]string(nil), typed...)
+	case []byte:
+		return append([]byte(nil), typed...)
+	case json.RawMessage:
+		return append(json.RawMessage(nil), typed...)
+	default:
+		return value
+	}
+}
+
 func normalizeReferenceMap(values map[string]ReferenceSource) map[string]ReferenceSource {
 	if len(values) == 0 {
 		return nil
diff --git a/internal/framework/pipeline/runner.go b/internal/framework/pipeline/runner.go
index 87e11ab..82cd730 100644
--- a/internal/framework/pipeline/runner.go
+++ b/internal/framework/pipeline/runner.go
@@ -21,15 +21,16 @@ import (
 )
 
 type Registries struct {
-	Inputs          *InputAdapterRegistry
-	Chunkers        *ChunkerRegistry
-	ArtifactCodecs  *ArtifactCodecRegistry
-	Extractors      *ExtractorRegistry
-	Mergers         *MergerRegistry
-	Normalizers     *NormalizerRegistry
-	Validators      *ValidatorRegistry
-	ValidatorChains *ValidatorChainRegistry
-	Outputs         *OutputEncoderRegistry
+	Inputs           *InputAdapterRegistry
+	Chunkers         *ChunkerRegistry
+	ArtifactCodecs   *ArtifactCodecRegistry
+	ArtifactEvidence *ArtifactEvidenceRegistry
+	Extractors       *ExtractorRegistry
+	Mergers          *MergerRegistry
+	Normalizers      *NormalizerRegistry
+	Validators       *ValidatorRegistry
+	ValidatorChains  *ValidatorChainRegistry
+	Outputs          *OutputEncoderRegistry
 }
 
 type Runner struct{}
diff --git a/internal/modules/dnd/register/evidence.go b/internal/modules/dnd/register/evidence.go
new file mode 100644
index 0000000..6867438
--- /dev/null
+++ b/internal/modules/dnd/register/evidence.go
@@ -0,0 +1,74 @@
+package register
+
+import (
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+)
+
+func registerEvidence(registry *pipeline.ArtifactEvidenceRegistry) error {
+	return runRegistrations([]registration{
+		{name: "spells evidence", register: func() error { return pipeline.RegisterArtifactEvidence(registry, dnd.SpellListKind, spellEvidence) }},
+		{name: "npcs evidence", register: func() error { return pipeline.RegisterArtifactEvidence(registry, dnd.NPCListKind, npcEvidence) }},
+		{name: "combat turns evidence", register: func() error {
+			return pipeline.RegisterArtifactEvidence(registry, dnd.CombatTurnListKind, combatTurnEvidence)
+		}},
+		{name: "item events evidence", register: func() error {
+			return pipeline.RegisterArtifactEvidence(registry, dnd.ItemEventListKind, itemEventEvidence)
+		}},
+		{name: "npc interactions evidence", register: func() error {
+			return pipeline.RegisterArtifactEvidence(registry, dnd.NPCInteractionListKind, npcInteractionEvidence)
+		}},
+		{name: "scene descriptions evidence", register: func() error {
+			return pipeline.RegisterArtifactEvidence(registry, dnd.SceneDescriptionListKind, sceneDescriptionEvidence)
+		}},
+	})
+}
+
+func spellEvidence(value dnd.SpellList) []source.SourceRef {
+	var refs []source.SourceRef
+	for _, record := range value.SpellCasts {
+		refs = append(refs, record.SourceRefs...)
+	}
+	return append([]source.SourceRef(nil), refs...)
+}
+
+func npcEvidence(value dnd.NPCList) []source.SourceRef {
+	var refs []source.SourceRef
+	for _, record := range value.NPCs {
+		refs = append(refs, record.SourceRefs...)
+	}
+	return append([]source.SourceRef(nil), refs...)
+}
+
+func combatTurnEvidence(value dnd.CombatTurnList) []source.SourceRef {
+	var refs []source.SourceRef
+	for _, record := range value.CombatTurns {
+		refs = append(refs, record.SourceRefs...)
+	}
+	return append([]source.SourceRef(nil), refs...)
+}
+
+func itemEventEvidence(value dnd.ItemEventList) []source.SourceRef {
+	var refs []source.SourceRef
+	for _, record := range value.Events {
+		refs = append(refs, record.SourceRefs...)
+	}
+	return append([]source.SourceRef(nil), refs...)
+}
+
+func npcInteractionEvidence(value dnd.NPCInteractionList) []source.SourceRef {
+	var refs []source.SourceRef
+	for _, record := range value.Interactions {
+		refs = append(refs, record.SourceRefs...)
+	}
+	return append([]source.SourceRef(nil), refs...)
+}
+
+func sceneDescriptionEvidence(value dnd.SceneDescriptionList) []source.SourceRef {
+	refs := make([]source.SourceRef, 0, len(value.Scenes))
+	for _, record := range value.Scenes {
+		refs = append(refs, record.SourceRef)
+	}
+	return refs
+}
diff --git a/internal/modules/dnd/register/register.go b/internal/modules/dnd/register/register.go
index dbb2f80..ce11618 100644
--- a/internal/modules/dnd/register/register.go
+++ b/internal/modules/dnd/register/register.go
@@ -21,6 +21,9 @@ func Register(registries pipeline.Registries, assets *llm.AssetRegistry) error {
 	if err := registerModules(registries); err != nil {
 		return err
 	}
+	if err := registerEvidence(registries.ArtifactEvidence); err != nil {
+		return err
+	}
 	if err := registerValidators(registries); err != nil {
 		return err
 	}
@@ -45,6 +48,8 @@ func validateRegistries(registries pipeline.Registries, assets *llm.AssetRegistr
 		return fmt.Errorf("dnd registrar: chunker registry must not be nil")
 	case registries.ArtifactCodecs == nil:
 		return fmt.Errorf("dnd registrar: artifact codec registry must not be nil")
+	case registries.ArtifactEvidence == nil:
+		return fmt.Errorf("dnd registrar: artifact evidence registry must not be nil")
 	case registries.Extractors == nil:
 		return fmt.Errorf("dnd registrar: extractor registry must not be nil")
 	case registries.Mergers == nil:
diff --git a/internal/modules/dnd/register/register_test.go b/internal/modules/dnd/register/register_test.go
index 6004a16..1ac3fc3 100644
--- a/internal/modules/dnd/register/register_test.go
+++ b/internal/modules/dnd/register/register_test.go
@@ -50,6 +50,7 @@ func TestRegisterAddsDNDFamily(t *testing.T) {
 	assertContainsKeys(t, "extractors", registries.Extractors.RegisteredKeys(), []string{"dnd/spells", npcextract.Key, combatextract.Key, itemeventextract.Key, interactionextract.Key, scenedescriptionextract.Key})
 	assertContainsKeys(t, "normalizers", registries.Normalizers.RegisteredKeys(), []string{spellnormalize.Key, npcnormalize.Key, combatnormalize.Key, itemeventnormalize.Key, interactionnormalize.Key, scenedescriptionnormalize.Key, pipeline.DefaultNormalizeModule})
 	assertContainsArtifactKinds(t, registries.ArtifactCodecs.RegisteredKinds(), []contracts.ArtifactKind{dnd.SpellListKind, dnd.NPCListKind, dnd.CombatTurnListKind, dnd.ItemEventListKind, dnd.NPCInteractionListKind, dnd.SceneDescriptionListKind})
+	assertContainsArtifactKinds(t, registries.ArtifactEvidence.RegisteredKinds(), []contracts.ArtifactKind{dnd.SpellListKind, dnd.NPCListKind, dnd.CombatTurnListKind, dnd.ItemEventListKind, dnd.NPCInteractionListKind, dnd.SceneDescriptionListKind})
 	assertContainsArtifactKinds(t, registries.Mergers.RegisteredArtifactKinds(pipeline.DefaultMergeModule), []contracts.ArtifactKind{dnd.SpellListKind, dnd.NPCListKind, dnd.CombatTurnListKind, dnd.ItemEventListKind, dnd.NPCInteractionListKind, dnd.SceneDescriptionListKind})
 	assertContainsArtifactKinds(t, registries.Normalizers.RegisteredArtifactKinds(pipeline.DefaultNormalizeModule), []contracts.ArtifactKind{dnd.SpellListKind, dnd.NPCListKind, dnd.CombatTurnListKind, dnd.ItemEventListKind, dnd.NPCInteractionListKind, dnd.SceneDescriptionListKind})
 	assertContainsArtifactKinds(t, registries.Normalizers.RegisteredArtifactKinds(npcnormalize.Key), []contracts.ArtifactKind{dnd.NPCListKind})
@@ -318,6 +319,46 @@ func TestRegisterAddsDNDFamily(t *testing.T) {
 	}
 }
 
+func TestEvidenceProjectorsPreserveDirectReferencesWithIndependentStorage(t *testing.T) {
+	first := source.SourceRef{SourceID: "session", StartUnitID: 1, EndUnitID: 1}
+	second := source.SourceRef{SourceID: "session", StartUnitID: 2, EndUnitID: 2}
+	for _, test := range []struct {
+		name    string
+		project func() []source.SourceRef
+		want    []source.SourceRef
+	}{
+		{name: "spells", project: func() []source.SourceRef {
+			return spellEvidence(dnd.SpellList{SpellCasts: []dnd.SpellCast{{SourceRefs: []source.SourceRef{first, second}}}})
+		}, want: []source.SourceRef{first, second}},
+		{name: "npcs", project: func() []source.SourceRef {
+			return npcEvidence(dnd.NPCList{NPCs: []dnd.NPC{{SourceRefs: []source.SourceRef{first, second}}}})
+		}, want: []source.SourceRef{first, second}},
+		{name: "combat turns", project: func() []source.SourceRef {
+			return combatTurnEvidence(dnd.CombatTurnList{CombatTurns: []dnd.CombatTurn{{SourceRefs: []source.SourceRef{first, second}}}})
+		}, want: []source.SourceRef{first, second}},
+		{name: "item events", project: func() []source.SourceRef {
+			return itemEventEvidence(dnd.ItemEventList{Events: []dnd.ItemEvent{{SourceRefs: []source.SourceRef{first, second}}}})
+		}, want: []source.SourceRef{first, second}},
+		{name: "npc interactions", project: func() []source.SourceRef {
+			return npcInteractionEvidence(dnd.NPCInteractionList{Interactions: []dnd.NPCInteraction{{SourceRefs: []source.SourceRef{first, second}}}})
+		}, want: []source.SourceRef{first, second}},
+		{name: "scene descriptions", project: func() []source.SourceRef {
+			return sceneDescriptionEvidence(dnd.SceneDescriptionList{Scenes: []dnd.SceneDescription{{SourceRef: first}, {SourceRef: second}}})
+		}, want: []source.SourceRef{first, second}},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			got := test.project()
+			if !reflect.DeepEqual(got, test.want) {
+				t.Fatalf("projected references = %#v, want %#v", got, test.want)
+			}
+			got[0].StartUnitID = 99
+			if first.StartUnitID != 1 {
+				t.Fatal("projector returned aliased reference storage")
+			}
+		})
+	}
+}
+
 func referenceSlot(slots []contracts.ReferenceSlot, name string) contracts.ReferenceSlot {
 	for _, slot := range slots {
 		if slot.Name == name {
@@ -531,6 +572,7 @@ func TestRegisterRejectsMissingDNDDependenciesBeforeMutation(t *testing.T) {
 	}{
 		{name: "chunkers", remove: func(r *pipeline.Registries, _ **llm.AssetRegistry) { r.Chunkers = nil }, wantErr: "chunker registry"},
 		{name: "artifact codecs", remove: func(r *pipeline.Registries, _ **llm.AssetRegistry) { r.ArtifactCodecs = nil }, wantErr: "artifact codec registry"},
+		{name: "artifact evidence", remove: func(r *pipeline.Registries, _ **llm.AssetRegistry) { r.ArtifactEvidence = nil }, wantErr: "artifact evidence registry"},
 		{name: "extractors", remove: func(r *pipeline.Registries, _ **llm.AssetRegistry) { r.Extractors = nil }, wantErr: "extractor registry"},
 		{name: "mergers", remove: func(r *pipeline.Registries, _ **llm.AssetRegistry) { r.Mergers = nil }, wantErr: "merger registry"},
 		{name: "normalizers", remove: func(r *pipeline.Registries, _ **llm.AssetRegistry) { r.Normalizers = nil }, wantErr: "normalizer registry"},
@@ -568,15 +610,16 @@ func TestRegisterReportsDuplicateDNDRegistration(t *testing.T) {
 
 func completeRegistries() pipeline.Registries {
 	return pipeline.Registries{
-		Inputs:          pipeline.NewInputAdapterRegistry(),
-		Chunkers:        pipeline.NewChunkerRegistry(),
-		ArtifactCodecs:  pipeline.NewArtifactCodecRegistry(),
-		Extractors:      pipeline.NewExtractorRegistry(),
-		Mergers:         pipeline.NewMergerRegistry(),
-		Normalizers:     pipeline.NewNormalizerRegistry(),
-		Validators:      pipeline.NewValidatorRegistry(),
-		ValidatorChains: pipeline.NewValidatorChainRegistry(),
-		Outputs:         pipeline.NewOutputEncoderRegistry(),
+		Inputs:           pipeline.NewInputAdapterRegistry(),
+		Chunkers:         pipeline.NewChunkerRegistry(),
+		ArtifactCodecs:   pipeline.NewArtifactCodecRegistry(),
+		ArtifactEvidence: pipeline.NewArtifactEvidenceRegistry(),
+		Extractors:       pipeline.NewExtractorRegistry(),
+		Mergers:          pipeline.NewMergerRegistry(),
+		Normalizers:      pipeline.NewNormalizerRegistry(),
+		Validators:       pipeline.NewValidatorRegistry(),
+		ValidatorChains:  pipeline.NewValidatorChainRegistry(),
+		Outputs:          pipeline.NewOutputEncoderRegistry(),
 	}
 }
 
diff --git a/internal/modules/generic/output/json/encoder.go b/internal/modules/generic/output/json/encoder.go
index bfef442..ca5c0cd 100644
--- a/internal/modules/generic/output/json/encoder.go
+++ b/internal/modules/generic/output/json/encoder.go
@@ -28,6 +28,7 @@ var _ contracts.OutputEncoder = (*Encoder)(nil)
 
 type Options struct {
 	IncludeChunkMap bool
+	EvidenceContext pipeline.EvidenceContextPolicy
 }
 
 type Encoder struct {
@@ -39,6 +40,7 @@ func New() *Encoder {
 }
 
 func NewWithOptions(options Options) *Encoder {
+	options.EvidenceContext.LaneIDs = append([]string(nil), options.EvidenceContext.LaneIDs...)
 	return &Encoder{options: options}
 }
 
@@ -46,6 +48,15 @@ func (e *Encoder) Key() string {
 	return Key
 }
 
+func (e *Encoder) EvidenceContextPolicy() pipeline.EvidenceContextPolicy {
+	if e == nil {
+		return pipeline.EvidenceContextPolicy{}
+	}
+	policy := e.options.EvidenceContext
+	policy.LaneIDs = append([]string(nil), policy.LaneIDs...)
+	return policy
+}
+
 func (e *Encoder) Encode(ctx context.Context, req contracts.OutputRequest) (contracts.OutputResult, error) {
 	if e == nil {
 		return contracts.OutputResult{}, encoderErrorf("encoder must not be nil")
@@ -74,7 +85,7 @@ func ModuleSpec() pipeline.ModuleSpec {
 }
 
 func Register(registry *pipeline.OutputEncoderRegistry) error {
-	return registry.RegisterBuilderWithSpec(ModuleSpec(), validateOptions, func(request pipeline.BuildRequest) (contracts.OutputEncoder, error) {
+	return registry.RegisterBuilderWithProfileValidation(ModuleSpec(), validateOptions, validateProfileOptions, func(request pipeline.BuildRequest) (contracts.OutputEncoder, error) {
 		options, err := DecodeOptions(request.Options)
 		if err != nil {
 			return nil, err
@@ -89,17 +100,126 @@ func validateOptions(options map[string]any) error {
 }
 
 func DecodeOptions(options map[string]any) (Options, error) {
-	if err := pipeline.RejectUnknownOptions(options, "include_chunk_map"); err != nil {
+	if err := pipeline.RejectUnknownOptions(options, "include_chunk_map", "evidence_context"); err != nil {
 		return Options{}, encoderErrorf("%w", err)
 	}
+	decoded := Options{}
 	if value, ok := options["include_chunk_map"]; ok {
 		enabled, ok := value.(bool)
 		if !ok {
 			return Options{}, encoderErrorf("option %q must be a boolean", "include_chunk_map")
 		}
-		return Options{IncludeChunkMap: enabled}, nil
+		decoded.IncludeChunkMap = enabled
 	}
-	return Options{}, nil
+	if value, ok := options["evidence_context"]; ok {
+		policy, err := decodeEvidenceContextPolicy(value)
+		if err != nil {
+			return Options{}, err
+		}
+		decoded.EvidenceContext = policy
+	}
+	return decoded, nil
+}
+
+func validateProfileOptions(context pipeline.OutputProfileOptionContext, options map[string]any) error {
+	decoded, err := DecodeOptions(options)
+	if err != nil || !decoded.EvidenceContext.Enabled {
+		return err
+	}
+	configured := make(map[string]struct{}, len(context.LaneIDs))
+	for _, laneID := range context.LaneIDs {
+		configured[laneID] = struct{}{}
+	}
+	for _, laneID := range decoded.EvidenceContext.LaneIDs {
+		if _, ok := configured[laneID]; !ok {
+			return encoderErrorf("evidence_context lane %q is not configured", laneID)
+		}
+	}
+	return nil
+}
+
+func decodeEvidenceContextPolicy(value any) (pipeline.EvidenceContextPolicy, error) {
+	object, ok := value.(map[string]any)
+	if !ok {
+		return pipeline.EvidenceContextPolicy{}, encoderErrorf("option %q must be an object", "evidence_context")
+	}
+	if err := pipeline.RejectUnknownOptions(object, "enabled", "lanes", "window_units"); err != nil {
+		return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context: %w", err)
+	}
+	enabledValue, ok := object["enabled"]
+	if !ok {
+		return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context option %q is required", "enabled")
+	}
+	enabled, ok := enabledValue.(bool)
+	if !ok {
+		return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context option %q must be a boolean", "enabled")
+	}
+	if !enabled {
+		if _, ok := object["lanes"]; ok {
+			return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context option %q is not allowed when disabled", "lanes")
+		}
+		if _, ok := object["window_units"]; ok {
+			return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context option %q is not allowed when disabled", "window_units")
+		}
+		return pipeline.EvidenceContextPolicy{}, nil
+	}
+	rawLanes, ok := object["lanes"]
+	if !ok {
+		return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context option %q is required when enabled", "lanes")
+	}
+	lanes, err := decodeEvidenceLaneIDs(rawLanes)
+	if err != nil {
+		return pipeline.EvidenceContextPolicy{}, err
+	}
+	windowUnits := 3
+	if rawWindow, ok := object["window_units"]; ok {
+		value, ok := rawWindow.(int)
+		if !ok {
+			return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context option %q must be an integer", "window_units")
+		}
+		if value < 0 {
+			return pipeline.EvidenceContextPolicy{}, encoderErrorf("evidence_context option %q must not be negative", "window_units")
+		}
+		windowUnits = value
+	}
+	return pipeline.EvidenceContextPolicy{Enabled: true, WindowUnits: windowUnits, LaneIDs: lanes}, nil
+}
+
+func decodeEvidenceLaneIDs(value any) ([]string, error) {
+	var raw []any
+	switch typed := value.(type) {
+	case []any:
+		raw = typed
+	case []string:
+		raw = make([]any, len(typed))
+		for i := range typed {
+			raw[i] = typed[i]
+		}
+	default:
+		return nil, encoderErrorf("evidence_context option %q must be an array", "lanes")
+	}
+	if len(raw) == 0 {
+		return nil, encoderErrorf("evidence_context option %q must not be empty", "lanes")
+	}
+	seen := make(map[string]struct{}, len(raw))
+	lanes := make([]string, 0, len(raw))
+	for _, value := range raw {
+		lane, ok := value.(string)
+		if !ok {
+			return nil, encoderErrorf("evidence_context lane values must be strings")
+		}
+		lane = strings.TrimSpace(lane)
+		if lane == "" {
+			return nil, encoderErrorf("evidence_context lane values must not be empty")
+		}
+		if _, ok := seen[lane]; ok {
+			return nil, encoderErrorf("evidence_context lane %q is duplicated", lane)
+		}
+		seen[lane] = struct{}{}
+		lanes = append(lanes, lane)
+	}
+	sort.Strings(lanes)
+	return lanes, nil
 }
 
 type indexFile struct {
diff --git a/internal/modules/generic/output/json/encoder_test.go b/internal/modules/generic/output/json/encoder_test.go
index 622b759..1f5c152 100644
--- a/internal/modules/generic/output/json/encoder_test.go
+++ b/internal/modules/generic/output/json/encoder_test.go
@@ -68,13 +68,62 @@ func TestDecodeOptions(t *testing.T) {
 			if err != nil {
 				t.Fatalf("DecodeOptions() error = %v, want nil", err)
 			}
-			if got != test.want {
+			if !reflect.DeepEqual(got, test.want) {
 				t.Fatalf("DecodeOptions() = %#v, want %#v", got, test.want)
 			}
 		})
 	}
 }
 
+func TestDecodeEvidenceContextOptions(t *testing.T) {
+	for _, test := range []struct {
+		name    string
+		options map[string]any
+		want    pipeline.EvidenceContextPolicy
+		wantErr string
+	}{
+		{name: "disabled", options: map[string]any{"evidence_context": map[string]any{"enabled": false}}},
+		{name: "enabled default window", options: map[string]any{"evidence_context": map[string]any{"enabled": true, "lanes": []any{"npcs"}}}, want: pipeline.EvidenceContextPolicy{Enabled: true, WindowUnits: 3, LaneIDs: []string{"npcs"}}},
+		{name: "explicit zero window and normalized lanes", options: map[string]any{"evidence_context": map[string]any{"enabled": true, "lanes": []any{" spells ", "npcs"}, "window_units": 0}}, want: pipeline.EvidenceContextPolicy{Enabled: true, WindowUnits: 0, LaneIDs: []string{"npcs", "spells"}}},
+		{name: "duplicate lanes", options: map[string]any{"evidence_context": map[string]any{"enabled": true, "lanes": []any{"npcs", " npcs "}}}, wantErr: "duplicated"},
+		{name: "unknown nested option", options: map[string]any{"evidence_context": map[string]any{"enabled": false, "extra": true}}, wantErr: "unknown option"},
+		{name: "disabled nested fields", options: map[string]any{"evidence_context": map[string]any{"enabled": false, "lanes": []any{"npcs"}}}, wantErr: "not allowed"},
+		{name: "invalid object", options: map[string]any{"evidence_context": true}, wantErr: "must be an object"},
+		{name: "invalid lane type", options: map[string]any{"evidence_context": map[string]any{"enabled": true, "lanes": "npcs"}}, wantErr: "must be an array"},
+		{name: "invalid window type", options: map[string]any{"evidence_context": map[string]any{"enabled": true, "lanes": []any{"npcs"}, "window_units": "3"}}, wantErr: "must be an integer"},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			got, err := DecodeOptions(test.options)
+			if test.wantErr != "" {
+				if err == nil || !strings.Contains(err.Error(), test.wantErr) {
+					t.Fatalf("DecodeOptions() error = %v, want %q", err, test.wantErr)
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("DecodeOptions() error = %v, want nil", err)
+			}
+			if !reflect.DeepEqual(got.EvidenceContext, test.want) {
+				t.Fatalf("EvidenceContext = %#v, want %#v", got.EvidenceContext, test.want)
+			}
+		})
+	}
+}
+
+func TestProfileValidationRejectsUnknownEvidenceLaneAndCopiesInputs(t *testing.T) {
+	registry := pipeline.NewOutputEncoderRegistry()
+	if err := Register(registry); err != nil {
+		t.Fatal(err)
+	}
+	options := map[string]any{"evidence_context": map[string]any{"enabled": true, "lanes": []any{"npcs"}}}
+	if err := registry.ValidateProfileOptions(Key, pipeline.OutputProfileOptionContext{LaneIDs: []string{"npcs", "spells"}}, options); err != nil {
+		t.Fatalf("ValidateProfileOptions() error = %v, want nil", err)
+	}
+	if err := registry.ValidateProfileOptions(Key, pipeline.OutputProfileOptionContext{LaneIDs: []string{"spells"}}, options); err == nil || !strings.Contains(err.Error(), "not configured") {
+		t.Fatalf("ValidateProfileOptions() error = %v, want unknown lane failure", err)
+	}
+}
+
 func TestEncodeReturnsLogicalFilesForNormalizedOutputs(t *testing.T) {
 	req := contracts.OutputRequest{
 		Manifest: artifacts.RunManifest{RunID: "run-1", PipelineID: "pipeline-1"},
diff --git a/internal/modules/integration/concurrent_runner_test.go b/internal/modules/integration/concurrent_runner_test.go
index ba644f6..594ecee 100644
--- a/internal/modules/integration/concurrent_runner_test.go
+++ b/internal/modules/integration/concurrent_runner_test.go
@@ -153,7 +153,7 @@ func TestRunnerIndependentlyBoundsWorkersAndProviderCallsAcrossRegisteredModules
 	if err != nil {
 		t.Fatalf("Resolve() error = %v", err)
 	}
-	registries := pipeline.Registries{Inputs: catalog.Inputs, Chunkers: catalog.Chunkers, ArtifactCodecs: catalog.ArtifactCodecs, Extractors: catalog.Extractors, Mergers: catalog.Mergers, Normalizers: catalog.Normalizers, Validators: catalog.Validators, ValidatorChains: catalog.ValidatorChains, Outputs: catalog.Outputs}
+	registries := pipeline.Registries{Inputs: catalog.Inputs, Chunkers: catalog.Chunkers, ArtifactCodecs: catalog.ArtifactCodecs, ArtifactEvidence: catalog.ArtifactEvidence, Extractors: catalog.Extractors, Mergers: catalog.Mergers, Normalizers: catalog.Normalizers, Validators: catalog.Validators, ValidatorChains: catalog.ValidatorChains, Outputs: catalog.Outputs}
 	output, err := runPreparedPipeline(t, registries, resolved.ResolvedPipeline, client, pipeline.RunInput{RawInput: readDNDSpellsFixture(t), ExtractWorkers: 3})
 	if err != nil {
 		t.Fatalf("Run() error = %v", err)
diff --git a/internal/modules/integration/dnd_npcs_runner_test.go b/internal/modules/integration/dnd_npcs_runner_test.go
index a4d207c..781fca1 100644
--- a/internal/modules/integration/dnd_npcs_runner_test.go
+++ b/internal/modules/integration/dnd_npcs_runner_test.go
@@ -287,15 +287,16 @@ func (client *fakeNPCProductionLLMClient) requestCount(promptID string) int {
 func productionNPCRegistries(t *testing.T) pipeline.Registries {
 	t.Helper()
 	registries := pipeline.Registries{
-		Inputs:          pipeline.NewInputAdapterRegistry(),
-		Chunkers:        pipeline.NewChunkerRegistry(),
-		ArtifactCodecs:  pipeline.NewArtifactCodecRegistry(),
-		Extractors:      pipeline.NewExtractorRegistry(),
-		Mergers:         pipeline.NewMergerRegistry(),
-		Normalizers:     pipeline.NewNormalizerRegistry(),
-		Validators:      pipeline.NewValidatorRegistry(),
-		ValidatorChains: pipeline.NewValidatorChainRegistry(),
-		Outputs:         pipeline.NewOutputEncoderRegistry(),
+		Inputs:           pipeline.NewInputAdapterRegistry(),
+		Chunkers:         pipeline.NewChunkerRegistry(),
+		ArtifactCodecs:   pipeline.NewArtifactCodecRegistry(),
+		ArtifactEvidence: pipeline.NewArtifactEvidenceRegistry(),
+		Extractors:       pipeline.NewExtractorRegistry(),
+		Mergers:          pipeline.NewMergerRegistry(),
+		Normalizers:      pipeline.NewNormalizerRegistry(),
+		Validators:       pipeline.NewValidatorRegistry(),
+		ValidatorChains:  pipeline.NewValidatorChainRegistry(),
+		Outputs:          pipeline.NewOutputEncoderRegistry(),
 	}
 	assets := llm.NewAssetRegistry()
 	for _, registration := range []struct {
@@ -315,7 +316,7 @@ func productionNPCRegistries(t *testing.T) pipeline.Registries {
 
 func moduleCatalog(registries pipeline.Registries) pipeline.ModuleCatalog {
 	return pipeline.ModuleCatalog{
-		Inputs: registries.Inputs, Chunkers: registries.Chunkers, ArtifactCodecs: registries.ArtifactCodecs,
+		Inputs: registries.Inputs, Chunkers: registries.Chunkers, ArtifactCodecs: registries.ArtifactCodecs, ArtifactEvidence: registries.ArtifactEvidence,
 		Extractors: registries.Extractors, Mergers: registries.Mergers, Normalizers: registries.Normalizers,
 		Validators: registries.Validators, ValidatorChains: registries.ValidatorChains, Outputs: registries.Outputs,
 	}
diff --git a/internal/modules/integration/dnd_spells_config_test.go b/internal/modules/integration/dnd_spells_config_test.go
index 4de698e..c915183 100644
--- a/internal/modules/integration/dnd_spells_config_test.go
+++ b/internal/modules/integration/dnd_spells_config_test.go
@@ -88,6 +88,7 @@ func dndCapabilityCatalog(t *testing.T, inputSpec, extractorSpec pipeline.Module
 	}
 
 	codecs := pipeline.NewArtifactCodecRegistry()
+	evidence := pipeline.NewArtifactEvidenceRegistry()
 	if err := pipeline.RegisterArtifactCodec(codecs, spellcodec.New()); err != nil {
 		t.Fatalf("register capability codec: %v", err)
 	}
@@ -112,7 +113,7 @@ func dndCapabilityCatalog(t *testing.T, inputSpec, extractorSpec pipeline.Module
 	}
 
 	return pipeline.ModuleCatalog{
-		Inputs: inputs, Chunkers: chunkers, ArtifactCodecs: codecs, Extractors: extractors,
+		Inputs: inputs, Chunkers: chunkers, ArtifactCodecs: codecs, ArtifactEvidence: evidence, Extractors: extractors,
 		Mergers: mergers, Normalizers: normalizers, ValidatorChains: pipeline.NewValidatorChainRegistry(), Outputs: outputs,
 	}
 }
@@ -148,6 +149,7 @@ func dndSpellsTestCatalog(t *testing.T, specs dndSpellsCatalogSpecs) pipeline.Mo
 	chunkers := pipeline.NewChunkerRegistry()
 	extractors := pipeline.NewExtractorRegistry()
 	codecs := pipeline.NewArtifactCodecRegistry()
+	evidence := pipeline.NewArtifactEvidenceRegistry()
 	mergers := pipeline.NewMergerRegistry()
 	normalizers := pipeline.NewNormalizerRegistry()
 	outputs := pipeline.NewOutputEncoderRegistry()
@@ -218,14 +220,15 @@ func dndSpellsTestCatalog(t *testing.T, specs dndSpellsCatalogSpecs) pipeline.Mo
 	}
 
 	return pipeline.ModuleCatalog{
-		Inputs:          inputs,
-		Chunkers:        chunkers,
-		ArtifactCodecs:  codecs,
-		Extractors:      extractors,
-		Mergers:         mergers,
-		Normalizers:     normalizers,
-		ValidatorChains: pipeline.NewValidatorChainRegistry(),
-		Outputs:         outputs,
+		Inputs:           inputs,
+		Chunkers:         chunkers,
+		ArtifactCodecs:   codecs,
+		ArtifactEvidence: evidence,
+		Extractors:       extractors,
+		Mergers:          mergers,
+		Normalizers:      normalizers,
+		ValidatorChains:  pipeline.NewValidatorChainRegistry(),
+		Outputs:          outputs,
 	}
 }
 
diff --git a/internal/modules/integration/dnd_spells_runner_test.go b/internal/modules/integration/dnd_spells_runner_test.go
index 38b294e..df36d6d 100644
--- a/internal/modules/integration/dnd_spells_runner_test.go
+++ b/internal/modules/integration/dnd_spells_runner_test.go
@@ -284,13 +284,14 @@ func dndSpellsRunnerRegistries(t *testing.T) pipeline.Registries {
 
 	catalog := dndSpellsTestCatalog(t, dndSpellsCatalogSpecs{})
 	return pipeline.Registries{
-		Inputs:         catalog.Inputs,
-		Chunkers:       catalog.Chunkers,
-		ArtifactCodecs: catalog.ArtifactCodecs,
-		Extractors:     catalog.Extractors,
-		Mergers:        catalog.Mergers,
-		Normalizers:    catalog.Normalizers,
-		Outputs:        catalog.Outputs,
+		Inputs:           catalog.Inputs,
+		Chunkers:         catalog.Chunkers,
+		ArtifactCodecs:   catalog.ArtifactCodecs,
+		ArtifactEvidence: catalog.ArtifactEvidence,
+		Extractors:       catalog.Extractors,
+		Mergers:          catalog.Mergers,
+		Normalizers:      catalog.Normalizers,
+		Outputs:          catalog.Outputs,
 	}
 }