test(federation): 29 tests for federation.rs (was 0), engine dedup PRD
Federation test coverage (crates/wzp-relay/tests/federation.rs):
- room_hash: determinism, uniqueness, length, case sensitivity (5)
- is_global_room: static config, call-* implicit, exact match (3)
- resolve_global_room: static + call-* resolution (2)
- global_room_hash: canonical names, fallthrough, independence (4)
- forward_to_peers: zero peers, live QUIC datagram delivery (2)
- broadcast_signal: zero peers, live QUIC signal delivery (2)
- send_signal_to_peer: unknown fingerprint error (1)
- peer lookup: fingerprint normalization, IP, trust priority (5)
- accessors: local_tls_fp, cross_relay_tx, remote_participants (3)
- integration: full media egress over live QUIC link (1)
- edge case: exact room match (1)
Total relay tests: 120 (was 91). Full suite: 368 passing.
Also added PRD-engine-dedup.md for the engine.rs helper extraction
completed in the previous commit.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
d539a6dfb9