Remove unused history document copies

docs/roadmap/implementation.md

@@ -321,6 +321,13 @@ Findings: **D02, D03**.
 Owners: `internal/engine/override_decode.go`, `override_context.go`, `load.go`,
 `load_result.go`, and corresponding tests.
 
+Status: **complete** (D02, D03). Prior completed commits: `2736ddf`,
+`deb9aa5`, `ae3408a`, `ea27f17`, `08a8c25`, `877c497`, `8aba43d`,
+`7bf2f0c`, `0f9ecf1`. Validation passed:
+`env GOTOOLCHAIN=local GOPROXY=off GOTELEMETRY=off go test ./internal/engine -run 'Override|History|Explain|Secret|Independent' -count=1`,
+`env GOTOOLCHAIN=local GOPROXY=off GOTELEMETRY=off go test ./internal/engine -count=1`,
+and `git diff --check`.
+
 Remove `decodedOverrideResult.preCLI`, its clone, and assertions only about that
 unused output. Keep the pre-CLI context actually built from `before.final`.
 Remove `Inspection.structuralInput`, the final publication clone made solely for

internal/engine/load.go

@@ -93,7 +93,6 @@ type Inspection struct {
 	baseline         *document.Node
 	input            *document.Node
 	inputOrigins     map[string]Origin
-	structuralInput  *document.Node
 	preCLI           *document.Node
 	preCLIOrigins    map[string]Origin
 	postDecodeApps   []historyApplication

internal/engine/load_result.go

@@ -109,14 +109,13 @@ func publishLoadResult[T any](schema *schemaDescriptor, definition Definition[T]
 	}
 	decoded, metadata := resolved.decoded, resolved.metadata
 	final, applications, resolutionSnapshots := resolved.final, resolved.applications, resolved.snapshots
-	structuralInput := document.Clone(resolved.structuralInput)
 	preCLI := document.Clone(resolved.preCLI)
 	allApplications := append(cloneHistoryApplications(applications), cloneHistoryApplications(resolved.postDecodeApps)...)
 	finalizeMetadataPaths(&metadata, final, allApplications, decoded.baseline, resolved.structuralInput, resolved.preCLI, decoded.final)
 	secrets := classifySecretPathsWithEvidence(schema, definition.Secret, metadata, final, allApplications, resolved.versionEvidence, decoded.baseline, resolved.structuralInput, resolved.preCLI, decoded.final)
 	sources := sourceInfosWithVersionEvidence(accumulator.sources, resolved.versionEvidence, secrets, false)
-	retainedTrees := make([]*document.Node, 0, len(allApplications)+5)
-	retainedTrees = append(retainedTrees, decoded.final, final, structuralInput, preCLI)
+	retainedTrees := make([]*document.Node, 0, len(allApplications)+4)
+	retainedTrees = append(retainedTrees, decoded.final, final, preCLI)
 	for _, application := range allApplications {
 		retainedTrees = append(retainedTrees, application.value)
 	}
@@ -128,7 +127,6 @@ func publishLoadResult[T any](schema *schemaDescriptor, definition Definition[T]
 		baseline:         decoded.baseline,
 		input:            decoded.final,
 		inputOrigins:     cloneOriginIndex(decoded.origins),
-		structuralInput:  structuralInput,
 		preCLI:           preCLI,
 		preCLIOrigins:    cloneOrigins(resolved.preCLIOrigins),
 		postDecodeApps:   cloneHistoryApplications(resolved.postDecodeApps),

internal/engine/override_context_test.go

@@ -50,7 +50,7 @@ func TestPostDecodeOverrideContextOrdersDecodeCLIAndResolutionEvidence(t *testin
 		t.Fatalf("applyDecodedOverrides() issues = %#v", issues)
 	}
 	prepared := preparePostDecodeOverrideContext(input, decoded, assigned)
-	if prepared.structuralInput == structural || prepared.preCLI == decoded.final || prepared.decoded.final == assigned.preCLI ||
+	if prepared.structuralInput == structural || prepared.preCLI == decoded.final ||
 		prepared.decoded.final == assigned.final || prepared.referenceInput == assigned.final {
 		t.Fatal("structural, pre-CLI, post-CLI, and located snapshots are not detached")
 	}
@@ -88,10 +88,10 @@ func TestPostDecodeOverrideContextOrdersDecodeCLIAndResolutionEvidence(t *testin
 
 	inspection := Inspection{
 		metadata: prepared.metadata, baseline: decoded.baseline, input: assigned.final, inputOrigins: assigned.origins,
-		structuralInput: prepared.structuralInput, preCLI: prepared.preCLI, preCLIOrigins: prepared.preCLIOrigins,
+		preCLI: prepared.preCLI, preCLIOrigins: prepared.preCLIOrigins,
 		postDecodeApps: prepared.postDecodeApps, final: assigned.final,
 		applications: prepared.applications,
-		immutableLookup: buildDocumentLookup(prepared.structuralInput, prepared.preCLI, assigned.final,
+		immutableLookup: buildDocumentLookup(prepared.preCLI, assigned.final,
 			prepared.applications[0].value, prepared.postDecodeApps[0].value, prepared.postDecodeApps[1].value,
 			prepared.postDecodeApps[2].value, prepared.postDecodeApps[3].value),
 	}

internal/engine/override_decode.go

@@ -10,7 +10,6 @@ import (
 // contributions alongside the effective typed value and its inspection data.
 type decodedOverrideResult struct {
 	value     reflect.Value
-	preCLI    *document.Node
 	final     *document.Node
 	presence  map[string]inputPresence
 	origins   map[string]Origin
@@ -30,7 +29,6 @@ func applyDecodedOverrides(
 		return decodedOverrideResult{}, []decodeIssue{{code: CodeSchemaUnsupportedType, message: "decoded configuration does not match the schema"}}
 	}
 
-	preCLI := document.Clone(decoded.final)
 	working, cloneIssue := cloneConfiguration(schema, decoded.value, defaultProjectionLimits())
 	if cloneIssue != nil {
 		return decodedOverrideResult{}, []decodeIssue{decodeIssueFromProjection(cloneIssue)}
@@ -76,7 +74,6 @@ func applyDecodedOverrides(
 
 	return decodedOverrideResult{
 		value:     working,
-		preCLI:    preCLI,
 		final:     final,
 		presence:  presence,
 		origins:   origins,

internal/engine/override_test.go

@@ -622,8 +622,8 @@ func TestApplyDecodedOverridesUsesSchemaAndPreservesTypedOwnership(t *testing.T)
 		got.Text != "cli text" || got.Delay != 250*time.Millisecond || got.APIKey.name != "CLI_SECRET" || got.Maybe != nil {
 		t.Fatalf("post-decode configuration = %#v", got)
 	}
-	if result.preCLI == result.final || !reflect.DeepEqual(result.preCLI, decoded.final) || len(result.overrides) != len(batch.overrides) {
-		t.Fatalf("result snapshots/contributions = pre:%p final:%p overrides:%d", result.preCLI, result.final, len(result.overrides))
+	if len(result.overrides) != len(batch.overrides) {
+		t.Fatalf("result override contributions = %d, want %d", len(result.overrides), len(batch.overrides))
 	}
 	if _, explicit := result.presence["/items/0/enabled"]; explicit {
 		t.Fatalf("replacement list inherited presence from its discarded item: %#v", result.presence)