Document shared source version checks

records.go

@@ -197,14 +197,21 @@ type SourceInfo struct {
 	Kind          SourceKind
 	UnderlayIndex int
 	ImportedFrom  *Location
-	// VersionCheck is the sanitized source-local version declaration observed
-	// during an enabled source-version load. It is nil otherwise.
+	// VersionCheck is sanitized evidence for source-local declaration processing
+	// in an enabled source-version load. It is nil when that processing did not
+	// occur, including default mode and synthetic CLI sources. During callbacks
+	// and failed loads, text is conservatively withheld; successful final source
+	// records reflect completed sensitivity classification.
 	VersionCheck *SourceVersionCheck
 }
 
 // SourceVersionCheck describes a source-local version declaration observed
-// during an enabled load. Text is empty when classification or conservative
-// early-access redaction withholds it; Present and Null retain their meaning.
+// during an enabled load. A non-nil record with Present false records observed
+// absence, but does not imply that a checker ran or accepted a value. Text is
+// empty when sensitivity classification or conservative callback-time/failed-
+// load redaction withholds it; Present and Null retain their meaning. Copies
+// returned by source queries are detached. See docs/config.md for disclosure
+// and lifecycle details.
 type SourceVersionCheck struct {
 	Path     Path
 	Version  Version