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_services_shape_check.py

@@ -79,3 +79,11 @@ async def test_an_unknown_outcome_is_refused_before_anything_is_written():
          pytest.raises(ValueError):
         await record_shape_check(7, "skipped", written=1, unjudged=1)
     session.add.assert_not_called()
+
+
+def test_the_window_counts_turns_asks_and_asks_walked_past():
+    from scribe.services.shape_check import summarise
+
+    assert summarise([]) == {"checked": 0, "asked": 0, "left": 0}
+    got = summarise(["passed", "blocked", "judged_after_block", "blocked", "left_after_block"])
+    assert got == {"checked": 3, "asked": 2, "left": 1}