Expose prompt requirement inspection

docs/internal/runner.md

@@ -43,6 +43,15 @@ touch profile, artifact, schema, renderer, validator, admission, or model
 collaborators. The root [`Engine.InspectPrompt`](../../engine.go) GoDoc owns
 the public operation's exact contract.
 
+`InspectRequirements` uses the same prompt selection boundary, then selects the
+request profile or prompt default for identity and obtains the exact captured
+requirement snapshot. It analyzes that snapshot with the supplied caller
+variables and normalized direct-session bypass; it does not resolve target
+readiness or enter the preparation pipeline. Missing snapshot capability is a
+prompt-load failure rather than a source fallback. The root
+[`Engine.InspectRequirements`](../../requirements.go) GoDoc owns the public
+operation's exact contract.
+
 ## Shared Profile Selection
 
 The runner uses one profile-selection and target-resolution boundary for