Close deferred reporting before final delivery

docs/consumers/guide.md

@@ -136,7 +136,9 @@ installation alongside aliases and integration commands.
 `Report()` for formatted substantive values and optional text templates;
 use `Output()` or `RenderOutput()` for deliberate raw output. Use `Warn`, `Info`,
 `Progress`, and `Debug` for categorized messages. Queue a summary with
-`AtEnd().Info` when it belongs after the handler returns. The
+`AtEnd().Info` when it belongs after the handler returns. Deferred submissions
+are accepted until finalization begins; later submissions return
+`ErrReporterClosed`. The
 [CLI reference](../cli.md#reporting) owns flag grammar, visibility, prefixes,
 and status behavior.
 

docs/roadmap/audit/catalog.md

@@ -1,6 +1,6 @@
 # Consolidated audit catalog
 
-Status: **25 distinct open findings: three P2 and 22 P3**, consolidated from 30
+Status: **24 distinct open findings: two P2 and 22 P3**, consolidated from 30
 numbered entries in seven audit documents. Reviewed audit state:
 `db732e3a1de55c844f77870e1c6db683c2685d5d`.
 
@@ -76,6 +76,12 @@ Also noted in the [documentation cross-references](13-documentation.md#previousl
 
 ## F03 — P2: Finalization can discard an accepted deferred message
 
+**Complete.** The acceptance cutoff and batch detachment now share one locked
+transition. A deterministic regression reproduces the former lost submission and
+checks late empty/hidden submissions, accepted delivery, completion, and terminal
+ordering. Focused reporter tests passed normally and under the race detector;
+existing tests cover visibility and presentation failures.
+
 Core reporter finalization detaches the deferred batch before closing
 acceptance. A concurrent submission can return success while presentation is in
 progress, then be discarded when finalization clears the queue. The returned

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Audit remediation implementation plan
 
-Status: in progress; Stages 1–2 complete.
+Status: in progress; Stages 1–3 complete.
 
 Baseline: `d492c7747175c01a53261206c2b4356e53453621`. Before this sprint,
 intervening changes recorded decisions and retired the completed older
@@ -163,6 +163,13 @@ Complete when both binding replay and per-kind seed boundaries are isolated.
 
 ## Stage 3 — Close deferred acceptance atomically
 
+**Complete.** Finalization closes deferred acceptance while detaching its
+batch; completion and terminal reporting remain available. The channel-controlled
+regression failed against the original code and now passes alongside focused
+reporter and hidden-deferred tests, both normally and with `-race -count=1`, in
+the aligned Go 1.27.0 workspace with offline, read-only module resolution. The
+old reporter test wrappers were replaced with real selection and finalization.
+
 Findings: F03 and the reporter-lifecycle portion of F24. Source: `reporter.go`.
 
 1. Add a private deferred-acceptance/finalization state distinct from the final