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_services_forge.py

@@ -136,10 +136,10 @@ async def test_check_reports_version_and_identity():
     def handler(request):
         if request.url.path.endswith("/version"):
             return _json(200, {"version": "1.23.1"})
-        return _json(200, {"login": "scribe-bot"})
+        return _json(200, {"login": "grimoire-bot"})
 
     result = await _forge(handler).check()
-    assert result == {"ok": True, "version": "1.23.1", "username": "scribe-bot"}
+    assert result == {"ok": True, "version": "1.23.1", "username": "grimoire-bot"}
 
 
 # --- the configuration gate (build_adapter) ----------------------------------