rename(547): the plugin is grimoire — manifest, MCP key, hooks, env, skills

Step 3 of the Scribe -> Grimoire rename.

- Plugin `grimoire` in marketplace `grimoire-plugin`, MCP server key
  `grimoire`, so tools reach a session as mcp__plugin_grimoire_grimoire__*.
- hooks/scribe_* -> hooks/grimoire_*, their shell functions and the TMPDIR
  ledgers with them; SCRIBE_URL / SCRIBE_TOKEN / SCRIBE_HOOK_DIR /
  SCRIBE_LEDGER_DIRS -> GRIMOIRE_*; the project marker is `.grimoire`.
- skills/using-scribe -> using-grimoire, /grimoire:sync, stored processes
  arrive as grimoire-proc-<slug>; moment_actions names them the same way.
- Migration 0124 rewrites stored skill names (rule_moments,
  rule_moment_judgments, moment_mappings) from scribe:/scribe-proc- to
  grimoire:/grimoire-proc-, so a rule mounted on a skill keeps firing.
- Settings' install commands and MCP-only defaults, the docs and the
  tests follow.
- scripts/check_plugin.py drops the smoke event for a report-check hook
  that has no file in plugin/hooks.

Kept on purpose: the secret-sealing label, and the names that let backups
written as Scribe restore and be counted.

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

tests/test_pattern_coverage.py

@@ -1,7 +1,7 @@
 """Pattern-library coverage — the extractor that mirrors the hook,
 the shape/record matcher, and the end-to-end measurement on real Postgres.
 
-The extractor here and the hook's awk program (scribe_prior_art.sh ARM 1)
+The extractor here and the hook's awk program (grimoire_prior_art.sh ARM 1)
 must agree on what counts as "a definition" — the metric and the write-path
 backstop are two views of the same doctrine. The EXTRACTION_VECTORS below
 deliberately reuse the definitions test_write_path_trigger stages for the
@@ -137,9 +137,9 @@ def test_the_hook_extractor_runs_and_agrees_line_for_line(text):
     """
     if shutil.which("awk") is None:            # pragma: no cover - env guard
         pytest.skip("awk not available")
-    lib = PLUGIN / "hooks" / "scribe_defs.sh"
+    lib = PLUGIN / "hooks" / "grimoire_defs.sh"
     out = subprocess.run(
-        ["bash", "-c", f'. "{lib}"; scribe_defs'],
+        ["bash", "-c", f'. "{lib}"; grimoire_defs'],
         input=text, capture_output=True, text=True,
     )
     assert out.returncode == 0, out.stderr