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_hook_pipefail_head.py

@@ -20,7 +20,7 @@ from pathlib import Path
 import pytest
 
 ROOT = Path(__file__).resolve().parents[1]
-DEFS = ROOT / "plugin" / "hooks" / "scribe_defs.sh"
+DEFS = ROOT / "plugin" / "hooks" / "grimoire_defs.sh"
 
 
 def test_the_duplicate_arm_still_names_a_name_defined_in_thousands_of_files(tmp_path):
@@ -40,7 +40,7 @@ def test_the_duplicate_arm_still_names_a_name_defined_in_thousands_of_files(tmp_
     subprocess.run(["git", "add", "."], cwd=repo, check=True, env=env)
     subprocess.run(["git", "commit", "-q", "-m", "base"], cwd=repo, check=True, env=env)
 
-    script = f'set -uo pipefail\n. "{DEFS}"\nprintf "sym\\tslug\\n" | scribe_local_dups "{repo}" new.py\n'
+    script = f'set -uo pipefail\n. "{DEFS}"\nprintf "sym\\tslug\\n" | grimoire_local_dups "{repo}" new.py\n'
     out = subprocess.run(["bash", "-c", script], capture_output=True, text=True, env=env, timeout=60)
     assert out.returncode == 0, out.stderr
     assert "`slug` is already defined in 4 other file(s)" in out.stdout