feat: show the Stop report as one line under the answer through the mod

[breferrari]

What

With the mod loaded, the Stop report becomes one line under the answer, and the agent gets the full report with the next prompt the person sends. Stacked on #271; review only this diff.

Why

The settings hook's Stop channels are all visible or all lost: a block reason prints as "Stop hook error", additionalContext as "Stop hook feedback", and a systemMessage never reaches the model. The mod has one per reader: turn.complete draws a line for the person, prompt.submit context reaches the model unseen.

How

 classic.Stop
+  run stop-checklist.ts in report mode (5 s, as the hook); on failure drop the queue, throw
+  findings this session was not given ($.store) → queue { report, line, urgent }
 turn.complete (a completed main-loop answer)
+  draw the line after any set below; an urgent finding → the plugin's own prompt, once per person's prompt
 prompt.submit (the person's prompt, or ours)
+  take the record, hold the prompt as in flight, attach the report; put it back if the prompt never enters
 turn.start
+  the turn ran that prompt (whole lines): delivered, in $.store; another ran first: put it back
 classic.SessionStart
+  any start but a compaction drops the queue

Case	What happens
Same findings	Nothing queued
Resume in a new process	Not repeated once delivered; a report that never reached the agent is queued again
A peer, notification, schedule, another plugin	Passes without the report
Prompt blocked, failing, or pulled out of the queue unrun	The report goes back
A report in flight across /clear	Not put back into the new conversation
Mod's own run fails	Its queue is dropped; the settings hook delivers
An urgent finding	One plugin turn per prompt the person sends. The template defines none; a vault that does gets the turn

Verification

A turn starts inside its own prompt's next() (observed on 2.1.288), so the prompt is held as in flight before next is called. Held after it, the first live run re-delivered the report on every other prompt; the kit test now starts the turn inside next across six turns.

• Live, 2.1.288, trusted vault, seven turns: the line drew under each changed report's answer, the next prompt quoted the report's first sentence, every later prompt said NONE. Across --resume in a new process: a delivered report is not sent again, a waiting one arrives once.
• claude plugin test: 72 pass. npm test: 1649 pass, 0 fail. Demonstrated red: 41 mutations on the final code, all killed.

Merge danger

Door: two-way. The plugin's store holds one small map of session ids.
Blast radius: Claude Code sessions with the mod. Without the flag, the settings hook is unchanged.

Closes #266
Part of #262

🤖 Generated with Claude Code

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