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/services/plugin_context.py

@@ -508,8 +508,8 @@ def _slugify(text: str) -> str:
 async def build_process_manifest(user_id: int) -> dict:
     """List the user's stored Processes as auto-surfacing skill-stub specs.
 
-    The plugin's sync script (scribe_sync_processes.sh) writes one
-    ~/.claude/skills/scribe-proc-<slug>/SKILL.md per entry — `description` is the
+    The plugin's sync script (grimoire_sync_processes.sh) writes one
+    ~/.claude/skills/grimoire-proc-<slug>/SKILL.md per entry — `description` is the
     auto-surface trigger, and the stub body calls get_process(name) for the live
     procedure (single source of truth in the DB). Reuses the list_processes query
     (note_type='process'). Instance-agnostic: derived from whatever Processes the
@@ -2052,7 +2052,7 @@ async def build_session_context(
     Args:
         user_id: the operator.
         project_id: the resolved active project (0 = none). The endpoint
-            resolves this from the working repo's remote, or from a `.scribe`
+            resolves this from the working repo's remote, or from a `.grimoire`
             marker file naming the project directly — the only key a session
             outside a git repo has. A non-zero id that does not
             resolve is reported rather than silently dropped.