Cut over public engine construction to ConfigKit sources

internal/configuration/prompts.go

@@ -1,6 +1,7 @@
 package configuration
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -310,3 +311,25 @@ func (state *loaded) prompt(id, version string) (*domain.PromptDefinition, domai
 	inspection.Inputs = append([]domain.PromptInput(nil), inspection.Inputs...)
 	return &definition, inspection, nil
 }
+
+// GetPromptSnapshot returns an independently owned captured definition and its
+// construction-time hash. Lookup retains literal ID and version keys.
+func (state *loaded) GetPromptSnapshot(ctx context.Context, id, version string) (*domain.PromptDefinition, string, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, "", err
+	}
+	definition, inspection, err := state.prompt(id, version)
+	if errors.Is(err, errPromptNotFound) {
+		return nil, "", promptdef.ErrPromptDefinitionNotFound
+	}
+	if err != nil {
+		return nil, "", err
+	}
+	return definition, inspection.PromptHash, nil
+}
+
+// GetPromptDefinition implements the runner's prompt lookup boundary.
+func (state *loaded) GetPromptDefinition(ctx context.Context, id, version string) (*domain.PromptDefinition, error) {
+	definition, _, err := state.GetPromptSnapshot(ctx, id, version)
+	return definition, err
+}

internal/configuration/targets.go

@@ -177,3 +177,14 @@ func (state *loaded) GetBackend(id string) (domain.Backend, error) {
 	}
 	return state.registry.GetBackend(id)
 }
+
+// CapacityPolicies returns the selected backend admission policies.
+func (state *loaded) CapacityPolicies() map[string]domain.BackendCapacityPolicy {
+	if state == nil {
+		return nil
+	}
+	return state.registry.CapacityPolicies()
+}
+
+// ExactIDs indicates that ConfigKit definition keys are literal identities.
+func (state *loaded) ExactIDs() bool { return true }