refactor: restructure add-gmail skill for new skill architecture

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

.claude/skills/add-gmail/manifest.yaml

@@ -0,0 +1,21 @@
+skill: gmail
+version: 1.0.0
+description: "Gmail integration via Google APIs"
+core_version: 0.1.0
+adds:
+  - src/channels/gmail.ts
+  - src/channels/gmail.test.ts
+modifies:
+  - src/index.ts
+  - src/config.ts
+  - src/container-runner.ts
+  - container/agent-runner/src/index.ts
+  - src/routing.test.ts
+structured:
+  npm_dependencies:
+    googleapis: "^144.0.0"
+  env_additions:
+    - GMAIL_CHANNEL_ENABLED
+conflicts: []
+depends: []
+test: "npx vitest run src/channels/gmail.test.ts"