Consolidate NEXA_SPEC.md and NEXA_PROTOCOL_SPEC.md into CLAUDE.md as the
single source of truth, updating the behavioral notes to reflect what
live debugging on axiom.trade actually found (rather than the original
spec's assumptions) and adding the backend WebSocket wire contract.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01CHESr7MTKG5Dc3mRPvWPn7