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>

tests/test_guidance_ownership.py

@@ -198,6 +198,11 @@ TOPICS: tuple[Topic, ...] = (
     Topic("reuse recorded shapes; record at first build", "skill:reusing-code",
           ("create_snippet", "when_to_use", "first build", "second copy"),
           "prior art offered beside a write is not noise", index=("create_snippet",)),
+    # Milestone 439: the writer judges what it wrote, at the end of the turn,
+    # asked by the plugin's Stop hook — the moment the knowledge exists.
+    Topic("judge what you wrote before the turn ends", "skill:reusing-code",
+          ("before the turn ends", "classify_shapes", 'kind: "file"'),
+          "you are the one who knows what the code you just wrote is"),
     Topic("report back where the work stands", "skill:reporting-back", ("reporting-back", "placement"),
           "take the placement from the record"),
     Topic("the operator's own reply shapes come first", "skill:reporting-back",