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>

frontend/src/views/SettingsView.vue

@@ -570,7 +570,7 @@ const copiedSnippetKey = ref<string | null>(null);
 // preferences carry across visits without needing a server-side setting.
 const _MCP_NAME_KEY = 'mcp_server_name';
 const _MCP_SCOPE_KEY = 'mcp_scope';
-const _DEFAULT_MCP_NAME = 'scribe';
+const _DEFAULT_MCP_NAME = 'grimoire';
 const _isValidScope = (v: unknown): v is 'user' | 'project' | 'local' =>
   v === 'user' || v === 'project' || v === 'local';
 
@@ -635,8 +635,8 @@ const DEAD_PCT_WARN = 20; // dead-tuple ratio above this = autovacuum falling be
 const pluginInstallCommands = computed(() => {
   const mkt = (pluginMarketplaceUrl.value || '').trim()
     || serverMarketplaceUrl.value
-    || '<your-scribe-repo>.git';
-  return `/plugin marketplace add ${mkt}\n/plugin install scribe@scribe-plugin`;
+    || '<your-grimoire-repo>.git';
+  return `/plugin marketplace add ${mkt}\n/plugin install grimoire@grimoire-plugin`;
 });
 
 const mcpConfigSnippet = computed(() => JSON.stringify({
@@ -2644,7 +2644,7 @@ async function deleteUser(userId: number) {
               <strong>project id</strong> to scope the session-start context.
             </li>
             <li>
-              Restart Claude Code — <code>/mcp</code> shows <code>scribe</code> connected and your
+              Restart Claude Code — <code>/mcp</code> shows <code>grimoire</code> connected and your
               standing rules load at session start.
             </li>
           </ol>
@@ -2669,9 +2669,9 @@ async function deleteUser(userId: number) {
             <div class="mcp-client-config">
               <label class="mcp-config-field">
                 <span class="mcp-config-label">Server name</span>
-                <input v-model="mcpServerName" type="text" placeholder="scribe" class="settings-input" spellcheck="false" />
+                <input v-model="mcpServerName" type="text" placeholder="grimoire" class="settings-input" spellcheck="false" />
                 <span class="mcp-hint">
-                  Local label for the MCP-only path below. Examples: <code>scribe</code>, <code>scribe-dev</code>.
+                  Local label for the MCP-only path below. Examples: <code>grimoire</code>, <code>grimoire-dev</code>.
                 </span>
               </label>
               <label class="mcp-config-field">
@@ -2705,7 +2705,7 @@ async function deleteUser(userId: number) {
         <div v-else-if="mcpClientTab === 'claude-desktop'">
           <label class="mcp-config-field">
             <span class="mcp-config-label">Server name</span>
-            <input v-model="mcpServerName" type="text" placeholder="scribe" class="settings-input" spellcheck="false" />
+            <input v-model="mcpServerName" type="text" placeholder="grimoire" class="settings-input" spellcheck="false" />
             <span class="mcp-hint">The key used for this server in the config JSON below.</span>
           </label>
           <ol>