Implement call protocol wire types and framing
Implements src/protocol/wire.rs with:
- EventEnvelope (type/id/payload, JSON wire format with leading-slash op ids)
- ResponseEnvelope and CallError (with optional typed details, ADR-023)
- ResponseEnvelope::ok/error/not_found/forbidden helpers
- ResponseEnvelope -> EventEnvelope conversion (Ok -> call.responded, Err -> call.error)
- FrameFramedReader / FrameFramedWriter: 4-byte big-endian length-prefixed JSON frames
- FrameError: Io, Json, ConnectionClosed, InvalidFrame
- 20 unit tests covering round-trip, large payloads, truncated frames, helpers
Builds on the call/crate-init skeleton. See
docs/architecture/crates/call/call-protocol.md and ADR-005/012/023.
glm-5.2
c9898566b9