feat(shapes): the practice is written where it is read, and the coverage line measures the slip (milestone 439 step 6)

- reusing-code: "Before the turn ends — say what you built" — the four
  verdicts, the one classify_shapes(repo=…) call, and the component file as a
  shape. Description names the end-of-turn moment.
- shape-accounting: the writer judges; audits are the check that it held.
  The write path SUGGESTS (no more hook instances); component file rows and
  whole-file canon described; scoped covers Svelte too.
- _INSTRUCTIONS reuse line: "before the turn ends, say what you built
  (create_snippet the reusable, classify_shapes the rest)" — 1570/1600.
- Coverage line: "written-shape check (7d): N turns checked, M asked, K left
  unjudged", from the Stop hook's recorded outcomes; silent until the
  question has been put.
- test_guidance_ownership pins the new topic on reusing-code.
- prior-art hook header no longer says it stamps instance rows.

Plugin version minted.

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

src/scribe/mcp/server.py

@@ -56,7 +56,8 @@ reads Agent Skills) and in each tool's description.
   matched, not none. Rules bind; preferences guide and you keep them current;
   lessons inform.
 - Search before acting or building, scoped with the active project_id; start
-  from a recorded snippet, and create_snippet what you build.
+  from a recorded snippet; before the turn ends, say what you built
+  (create_snippet the reusable, classify_shapes the rest).
 - Work is tasks (a fix is kind="issue"): in_progress on start, add_task_log as
   you go, done on finish; tag system_ids.
 - A plan is a milestone: find the existing one