feat(sessions): make pinning every tab name an opt-in setting

Add pinCliSessionName (synced, default OFF), re-read at each spawn and respawn.
Off keeps the #457 behaviour; on pins every non-blank tab name as --name.
Update the docs, JSDoc and changeset that stated the old rule.

src/web/public/index.html

@@ -2787,6 +2787,13 @@
                     </div>
                     <label class="switch switch-sm"><input type="checkbox" id="appSettingsWorkspaceHooks"><span class="slider"></span></label>
                   </div>
+                  <div class="set-row" data-search="pin cli session name resume title tab label">
+                    <div class="set-row-text">
+                      <span class="set-row-label">Pin tab names on the CLI</span>
+                      <span class="set-row-desc">Launch every Claude session with its tab name, so the CLI's prompt label and /resume list match your tabs. Claude then stops generating its own titles for those sessions, and a rename in Codeman holds only until the next turn. Applies from the next session start or respawn, no server restart needed.</span>
+                    </div>
+                    <label class="switch switch-sm"><input type="checkbox" id="appSettingsPinCliSessionName"><span class="slider"></span></label>
+                  </div>
                   <div class="set-row" data-search="remote auto reconnect ssh">
                     <div class="set-row-text">
                       <span class="set-row-label">Remote auto-reconnect</span>

src/web/public/settings-ui.js

@@ -588,6 +588,7 @@ Object.assign(CodemanApp.prototype, {
     // Default ON: an absent key is a user who has never seen this setting, and OFF
     // for them means no tab alerts in any workspace Codeman did not scaffold.
     document.getElementById('appSettingsWorkspaceHooks').checked = settings.workspaceHooksEnabled !== false;
+    document.getElementById('appSettingsPinCliSessionName').checked = settings.pinCliSessionName === true;
     document.getElementById('appSettingsClaudeModel').value = settings.claudeModel ?? '';
     document.getElementById('appSettingsOpusContext1m').checked = settings.opusContext1mEnabled ?? false;
     document.getElementById('appSettingsRemoteAutoReconnect').checked = settings.remoteAutoReconnect ?? true;
@@ -2708,6 +2709,7 @@ Object.assign(CodemanApp.prototype, {
       agentTeamsEnabled: document.getElementById('appSettingsAgentTeams').checked,
       agentSkillEnabled: document.getElementById('appSettingsAgentSkill').checked,
       workspaceHooksEnabled: document.getElementById('appSettingsWorkspaceHooks').checked,
+      pinCliSessionName: document.getElementById('appSettingsPinCliSessionName').checked,
       claudeVoiceEnabled: document.getElementById('appSettingsClaudeVoice').checked,
       claudeModel: document.getElementById('appSettingsClaudeModel').value,
       opusContext1mEnabled: document.getElementById('appSettingsOpusContext1m').checked,

src/web/schemas.ts

@@ -1425,6 +1425,14 @@ export const SettingsUpdateSchema = z
      * never added — for a user who wants Codeman to leave their repos alone.
      */
     workspaceHooksEnabled: z.boolean().optional(),
+    /**
+     * Launch every Claude session with `--name` set to its tab name (default OFF: only a
+     * name the user chose is pinned). Nothing acts on it in `PUT /api/settings`: it is read
+     * fresh from disk by readPinCliSessionNameEnabled() (hooks-config.ts) at every claude
+     * create and respawn, like readPlanUsageTelemetryEnabled(), so a toggle applies from the
+     * next spawn with no restart.
+     */
+    pinCliSessionName: z.boolean().optional(),
     /**
      * Let browser dictation transcribe through this machine's Claude Code login,
      * the same speech-to-text service the CLI's own `/voice` mode uses