Classify simple prompt requirement branches

docs/internal/sources.md

@@ -60,11 +60,20 @@ cover resource origins, context containment, capture, and selection.
 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
-`index` lookups. Branch-body references are conservatively conditional until
-condition analysis is applied; invoked named templates are scanned
-conservatively, and dependency-bearing range scopes make discovery incomplete.
-Uncalled definitions and bypassed session templates are not traversed. This
-internal walker does not change rendering behavior.
+`index` lookups. For `if` and `with`, it classifies branches when their
+conditions are simple supported values: direct values, literals, negation, or
+two-string equality/inequality. It uses Go template truthiness, so a supplied
+nonempty string such as `false` is true. Missing decision values and
+content-dependent conditions leave dependency-bearing branches conditional
+and report incomplete discovery; unresolved conditions with no branch
+dependencies do not by themselves make discovery incomplete. Recognizable
+references on known skipped paths remain optional inventory entries with an
+inactive-use explanation, unless another applicable use establishes a
+stronger classification. Skipped expressions are scanned only for
+syntactically recognizable names and are not evaluated. Invoked named
+templates are scanned conservatively, and dependency-bearing range scopes make
+discovery incomplete. Uncalled definitions and bypassed session templates are
+not traversed. This internal walker does not change rendering behavior.
 
 ## Profiles And Built-Ins