Pulse Protocol-Open semantic protocol for AI-to-AI communication

The repo doesn't just pitch a grand vision — it ships concrete tooling: a typed semantic vocabulary, JSON + MessagePack encodings for compact transport, automatic validation, HMAC signing and replay protection, and a CLI. Tests, coverage badges, and type-hints suggest usable engineering rather than a spec-only repo. Still, the real challenge is social: convincing vendors to adopt a 1,000‑concept vocabulary and run with a shared governance model — technical polish won't win that alone.