Add lightweight configuration lookups

docs/internal/sources.md

@@ -57,6 +57,15 @@ captured presence state. Runtime rendering still checks request variables and
 input helpers. The [prompt adapter tests](../../internal/configuration/prompts_test.go)
 cover resource origins, context containment, capture, and selection.
 
+The configuration adapter shares exact ID/version selection across its
+internal prompt lookups. The execution snapshot lookup returns an owned prompt
+definition and cached hash; metadata inspection returns owned input metadata
+without copying execution templates. Profile selection likewise has an
+identity-only lookup for consumers that do not need the execution target,
+while the full profile lookup continues to return an owned target and deep copy
+of provider extras. These lookups use captured indexes and do not query
+ConfigKit again.
+
 The `internal/prompt` requirement walker uses the captured parse trees and
 declaration metadata without executing templates or reading artifacts. It
 collects literal `input` names, direct root caller keys, and literal-key
@@ -103,8 +112,10 @@ snapshots with backend defaults and presence/suppression state. A profile can
 remain partial until runtime overrides complete it. `InspectProfile` selects
 that captured target without prompt, artifact, schema, credential lookup, or
 provider work. Preparation applies runtime overrides and then checks target
-completeness. The [target tests](../../internal/configuration/targets_test.go)
-cover effective target interpretation, while the [catalog tests](../../internal/catalog/catalog_test.go)
+completeness. Identity-only profile selection can identify a partial captured
+profile without copying its target or requiring readiness. The
+[target tests](../../internal/configuration/targets_test.go) cover effective
+target interpretation, while the [catalog tests](../../internal/catalog/catalog_test.go)
 cover selected released assets.
 
 ## Ordinary Artifacts