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_shape_check_hook.py

@@ -21,8 +21,8 @@ import pytest
 from tests.helpers import http_sink
 
 HOOKS = Path(__file__).resolve().parents[1] / "plugin" / "hooks"
-CHECK = HOOKS / "scribe_shape_check.sh"
-PRIOR_ART = HOOKS / "scribe_prior_art.sh"
+CHECK = HOOKS / "grimoire_shape_check.sh"
+PRIOR_ART = HOOKS / "grimoire_prior_art.sh"
 REASON = "SERVER REASON: judge what you wrote"
 
 
@@ -30,12 +30,12 @@ def _env(tmp_path, url="http://127.0.0.1:9"):
     for tool in ("curl", "bash", "git"):
         if shutil.which(tool) is None:
             pytest.skip(f"hook runtime tool {tool!r} not installed")
-    return {"PATH": os.environ["PATH"], "SCRIBE_URL": url, "SCRIBE_TOKEN": "t",
+    return {"PATH": os.environ["PATH"], "GRIMOIRE_URL": url, "GRIMOIRE_TOKEN": "t",
             "TMPDIR": str(tmp_path), "HOME": str(tmp_path)}
 
 
 def _ledger(tmp_path, session="s1"):
-    return tmp_path / "scribe-priorart" / f"{session}.written.ids"
+    return tmp_path / "grimoire-priorart" / f"{session}.written.ids"
 
 
 def _write_ledger(tmp_path, lines, session="s1"):