Agent Session Protocol updates

Agent Session Protocol updates https://agent-session-protocol.github.io/ 2026-09-01T00:00:00Z Agent Session Protocol maintainers Agent Session Protocol draft and USL reference implementation https://agent-session-protocol.github.io/docs 2026-09-01T00:00:00Z

Canonical agent-session events, fidelity declarations, opaque payload preservation, and the USL storage-first reference implementation.