Document profile and prompt identity listings

docs/internal/sources.md

@@ -21,6 +21,11 @@ profile inheritance. It retains ConfigKit's result privately for explicit
 inspection, not for per-run resolution. The runtime/domain packages do not
 depend on ConfigKit.
 
+After prompt materialization and effective-profile snapshot construction, the
+adapter captures lexically ordered, identity-only inventories from the final
+prompt and indexed-profile maps. Its listing methods return caller-owned copies
+of those inventories without consulting ConfigKit or copying definitions.
+
 The root `DirectoryInputs` and `FilesystemInputs` helpers discover sorted YAML
 files under an explicit root, provide resource context, and leave imports
 disabled. Each returned slice belongs to one strict-composition group; file
@@ -119,6 +124,10 @@ profile without copying its target or requiring readiness. The
 target interpretation, while the [catalog tests](../../internal/catalog/catalog_test.go)
 cover selected released assets.
 
+The internal engine delegates listing through a narrow identity-inventory
+interface directly to the configuration snapshot. The execution runner has no
+listing responsibility.
+
 ## Ordinary Artifacts
 
 `internal/artifact` accepts explicitly typed inline references even when their