feat(engineering): add google-workspace-cli skill with 5 Python tools

New skill for Google Workspace administration via the gws CLI:
- SKILL.md with 4 workflows (Gmail, Drive/Sheets, Calendar, Security Audit)
- 5 stdlib-only Python scripts (doctor, auth setup, recipe runner, audit, analyzer)
- 3 reference docs, 2 asset files, 43 built-in recipes, 10 persona bundles
- cs-workspace-admin agent, /google-workspace slash command
- Standalone marketplace plugin entry with .claude-plugin/plugin.json
- Cross-platform sync (Codex CLI, Gemini CLI), MkDocs docs pages
- All documentation updated (173 skills, 250 tools, 15 agents, 15 commands)

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

engineering-team/google-workspace-cli/.claude-plugin/plugin.json

@@ -0,0 +1,12 @@
+{
+  "name": "google-workspace-cli",
+  "version": "2.1.2",
+  "description": "Google Workspace administration via the gws CLI. Install, authenticate, and automate Gmail, Drive, Sheets, Calendar, Docs, Chat, and Tasks. 5 Python tools, 3 reference guides, 43 built-in recipes, 10 persona bundles.",
+  "author": {
+    "name": "Alireza Rezvani"
+  },
+  "repository": "https://github.com/alirezarezvani/claude-skills",
+  "license": "MIT",
+  "skills": "./",
+  "homepage": "https://github.com/alirezarezvani/claude-skills/tree/main/engineering-team/google-workspace-cli"
+}