Implement UCXL Protocol Foundation (Phase 1)

- Add complete UCXL address parser with BNF grammar validation
- Implement temporal navigation system with bounds checking
- Create UCXI HTTP server with REST-like operations
- Add comprehensive test suite with 87 passing tests
- Integrate with existing BZZZ architecture (opt-in via config)
- Support semantic addressing with wildcards and version control

Core Features:
- UCXL address format: ucxl://agent:role@project:task/temporal/path
- Temporal segments: *^, ~~N, ^^N, *~, *~N with navigation logic
- UCXI endpoints: GET/PUT/POST/DELETE/ANNOUNCE operations
- Production-ready with error handling and graceful shutdown

🤖 Generated with [Claude Code](https://claude.ai/code)

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

go.mod

@@ -7,6 +7,7 @@ toolchain go1.24.5
 require (
 	github.com/google/go-github/v57 v57.0.0
 	github.com/libp2p/go-libp2p v0.32.0
+	github.com/libp2p/go-libp2p-kad-dht v0.25.2
 	github.com/libp2p/go-libp2p-pubsub v0.10.0
 	github.com/multiformats/go-multiaddr v0.12.0
 	golang.org/x/oauth2 v0.15.0