Remove unused parser resource plumbing

docs/roadmap/audit/catalog.md

@@ -1,6 +1,6 @@
 # Consolidated audit catalog
 
-Status: **14 distinct open findings: 14 P3**, consolidated from 30
+Status: **13 distinct open findings: 13 P3**, consolidated from 30
 numbered entries in seven audit documents. Reviewed audit state:
 `db732e3a1de55c844f77870e1c6db683c2685d5d`.
 
@@ -257,6 +257,10 @@ consumer compatibility or migration work is needed.
 
 ## F12 — P3: Parser sessions carry unused execution resources
 
+**Complete.** Unused execution and parser resource plumbing was removed; the
+backend retains discard destinations and buffered help. Focused routing, help,
+context-forwarding and session-isolation tests passed.
+
 Core and the Cobra adapter duplicate stream normalization and retain context and
 streams through parser options and backend nodes, although the adapter parses
 and renders buffered help rather than executing callbacks or reading application