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Johnathan Corgan
1c2cda480d
Add TreeAnnounce v1 wire format with versioned encoding (version byte 0x01), slim ancestry entries (32 bytes each, no per-entry signatures), and transitive trust model where only the direct peer's declaration signature is verified. Key changes: - Enrich TreeCoordinate with CoordEntry metadata (sequence, timestamp) - TreeAnnounce encode/decode with roundtrip tests - Per-peer rate limiting (500ms minimum interval) on ActivePeer - Parent selection: depth-based algorithm with broken-path detection - New node/tree.rs module: send/receive, periodic refresh, cleanup - Wire up dispatch, initial announce on promotion, tick integration - Update gossip protocol design doc with trust model (§2.7) 304 tests pass, clean build.