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>

src/grimoire/mcp/server.py

@@ -17,7 +17,7 @@ from quart import Quart
 #     the duplicate gate, the guessed-id refusal, `systems_hint`,
 #     `placement` and `report_back` — at the moment it applies.
 #   - The bundled skills (Agent Skills, client-neutral): every reflex in full.
-#     `using-scribe` owns the working reflexes; the process skills own arcs.
+#     `using-grimoire` owns the working reflexes; the process skills own arcs.
 #   - Client adapters (the Claude Code plugin today): timing and that
 #     client's own conventions, never a copy of the above.
 # tests/test_guidance_ownership.py holds the topic registry that enforces it.
@@ -353,7 +353,7 @@ def build_mcp_server() -> MCPServer:
     Transport settings (statelessness, DNS-rebinding protection) are not
     here: since SDK v2 they belong to the ASGI app, built in `mount_mcp`.
     """
-    mcp = StrictArgsMCPServer("scribe", instructions=_INSTRUCTIONS.strip())
+    mcp = StrictArgsMCPServer("grimoire", instructions=_INSTRUCTIONS.strip())
     from grimoire.mcp.tools import register_all
     register_all(mcp)
     return mcp