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_db_ready.py

@@ -5,7 +5,7 @@ import pytest
 
 from grimoire.services.db_ready import asyncpg_dsn, wait_for_database
 
-URL = "postgresql+asyncpg://scribe:p%40ss@db:5432/scribe"
+URL = "postgresql+asyncpg://grimoire:p%40ss@db:5432/grimoire"
 
 
 class _Clock:
@@ -45,7 +45,7 @@ def _connect_failing(errors):
 
 
 def test_dsn_drops_the_driver_and_keeps_the_escaped_password():
-    assert asyncpg_dsn(URL) == "postgresql://scribe:p%40ss@db:5432/scribe"
+    assert asyncpg_dsn(URL) == "postgresql://grimoire:p%40ss@db:5432/grimoire"
 
 
 async def test_returns_at_once_when_the_database_is_up():