Add tests, templates, and Gitea Actions workflows

.templates/default/README.md

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+# Agent Workspace Setup
+
+This directory contains an isolated workspace for an AI agent.
+
+## Quick Start
+
+1. The environment has been automatically configured
+2. Check your `.env` file for available variables
+3. Dependencies have been installed if a `package.json` was present
+
+## Commands
+
+- `git-agent-sync status` - View current changes
+- `git-agent-sync diff` - Generate a diff for review
+- `git-agent-sync merge` - Merge changes back to main
+- `git-agent-sync destroy` - Remove this workspace (use with caution!)
+
+## Tips
+
+- Make your changes and use `git status` to track them
+- Use `git-agent-sync diff` to generate a code review diff
+- When ready, run `git-agent-sync merge` to merge back to the main branch