feat(venat): lay groundwork for Venat

[Xe]

• initial boilerplate
• agent loop interface
• pluggable AI backends into the agent loop
• tool registry
• web interface with HTMX and Tailwind
• formal specification
• ability to spawn claudes code with the right tools and environment details to do productive coding
• GitHub App integration
• Code compiles with go build ./...
• Code formatted with npm run format
• Manual testing

[github-actions]

The latest Buf updates on your PR. Results from workflow Go / build (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 23, 2026, 9:05 PM