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

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Audit remediation implementation plan
 
-Status: in progress; Stages 1–12 complete.
+Status: in progress; Stages 1–13 complete.
 
 Baseline: `d492c7747175c01a53261206c2b4356e53453621`. Before this sprint,
 intervening changes recorded decisions and retired the completed older
@@ -442,6 +442,12 @@ Complete F21 when both callers share one adapter and preserve their context.
 
 ## Stage 13 — Remove unused parser resource plumbing
 
+**Complete.** Parser options carry only alias selection, backend output and
+error destinations explicitly discard, and core retains invocation resources.
+The test-only App.parse wrapper was removed. Focused routed parsing, help,
+context, backend parsing and session-isolation tests passed in the offline aligned
+Go 1.27.0 workspace with `-mod=readonly`. F24 remains open for binding wrappers.
+
 Findings: F12 and parsing portion of F24. Sources: `execute.go`, `parser.go`,
 `internal/commandmeta/metadata.go`, and `internal/cobra/parse.go`.