Reconcile promotion and manifest documentation

docs/internal/stage-extract.md

@@ -65,6 +65,12 @@ Stdout receipt and stderr diagnostics remain separate. Downstream stages are
 not given selectable extraction sources unless the complete configured result
 has passed validation and promotion.
 
+When a replacement attempt begins, the current session-stage record no longer
+advertises payload from the previous success. A failed replacement therefore
+has no current outputs, logs, generated configuration references, or metadata,
+while the earlier invocation manifest and immutable promoted bundle remain
+available for audit and recovery.
+
 ## Implementation And Focused Tests
 
 - Stage execution, selection, and resume validation: `internal/stage/extract.go`,