feat(tools): add Google Calendar tools and register Gmail/GCal in daemon

Add calendar.today, calendar.list, calendar.search tools mirroring the
Gmail tool pattern. Includes gcal-auth CLI command, config schema, tool
policy entries (messaging/coding profiles + group:gcal), and 17 tests.
Also wires up gmail and gcal tool registration in the daemon and TUI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/index.ts

@@ -9,6 +9,7 @@ import { registerTuiCommand } from './tui.js';
 import { registerCompletionCommand } from './completion.js';
 import { registerSetupCommand } from './setup.js';
 import { registerGmailAuthCommand } from './gmail-auth.js';
+import { registerGcalAuthCommand } from './gcal-auth.js';
 
 export function createProgram(): Command {
   const program = new Command();
@@ -27,6 +28,7 @@ export function createProgram(): Command {
   registerCompletionCommand(program);
   registerSetupCommand(program);
   registerGmailAuthCommand(program);
+  registerGcalAuthCommand(program);
 
   return program;
 }