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_session_context_failure.py

@@ -16,16 +16,16 @@ from pathlib import Path
 
 from tests.helpers import need_tools
 
-HOOK = Path(__file__).resolve().parents[1] / "plugin" / "hooks" / "scribe_session_context.sh"
+HOOK = Path(__file__).resolve().parents[1] / "plugin" / "hooks" / "grimoire_session_context.sh"
 
 
 def run_hook(tmp_path: Path, url: str, marker_project: int | None = None) -> str:
     need_tools("bash", "curl", "awk")
     if marker_project is not None:
-        (tmp_path / ".scribe").write_text(json.dumps({
+        (tmp_path / ".grimoire").write_text(json.dumps({
             "instance": url, "project_id": marker_project, "project": "P",
         }))
-    env = {**os.environ, "SCRIBE_URL": url, "SCRIBE_TOKEN": "t",
+    env = {**os.environ, "GRIMOIRE_URL": url, "GRIMOIRE_TOKEN": "t",
            "CLAUDE_PROJECT_DIR": str(tmp_path)}
     r = subprocess.run(["bash", str(HOOK)], input=b'{"source":"startup"}',
                        capture_output=True, env=env, timeout=60)