Post team updates to Google Chat Spaces with git context and deployment notifications.

• Reads webhook URL and team config from .claude/settings.json; includes setup command to initialize per project
• Supports five message types: deployment, bugfix, feature complete, question, and custom updates with appropriate templates
• Automatically gathers git context (recent commits, branch, changed files) to enrich messages
• Proactively suggests posting updates after significant work, pushes to main, or when team input is needed