feat(watcher): add agent Gmail CLI with audit and defaults

Provide list/read/summarize plus reason-gated archive, label, draft, and forward-as-draft, with SQLite audit logging and default-mailbox resolution.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/watcher/package.json

@@ -7,7 +7,8 @@
     "start": "node src/index.js",
     "test": "node --test test/**/*.test.js",
     "process-messages": "node scripts/process-messages.js",
-    "list-messages": "node scripts/list-messages.js"
+    "list-messages": "node scripts/list-messages.js",
+    "gmail": "node scripts/gmail.js"
   },
   "dependencies": {
     "better-sqlite3": "^12.2.0",