feat(500): one end-of-turn request - the completion-section check folds into the reply check

The Stop hook sent the finished reply twice: scribe_report_check.sh checked a
task-closing reply for the completion sections in shell and reported to
/report-check, and scribe_reply_check.sh sent the same reply to /reply-rules
for the rule hold. Now the reply goes once. When the turn closed a task the
hook adds the close count and ids, and the server runs the section check
(services/report_check, the same three patterns) beside the reply hold,
folding both into one reason.

The report_check adherence log is still written for every checked reply
(milestone 409's number). A section hold marks the session, so its rewrite is
sent back once with rewrite:true to record how it came out, and is never held.
The block reason carries the completion shape's one line and points at
list_reply_shapes rather than at the skill. #5496 (step 4 of milestone 500).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugin/hooks/scribe_turn.awk

@@ -2,7 +2,7 @@
 #
 # Reads the flat `IDX<TAB>PATH<TAB>VALUE` stream that scribe_json.awk produces
 # in `mode=lines` from a Claude Code transcript, and answers the four questions
-# scribe_report_check.sh asks. It replaces a thirty-line jq program; the shape
+# the Stop hooks ask (scribe_reply_check.sh). It replaces a thirty-line jq program; the shape
 # of the answer is unchanged, so the hook around it reads the same.
 #
 #   bounded   1 if a user prompt was found in the window, else empty. A window