v1.3.180

Highlights

P2P direct connection: WebRTC DataChannel between Host (Go) and Mobile
(Flutter) is now stable with P2P-priority protocol, zero message loss, and
automatic relay fallback.
Message loss fix: sendViaTransport now falls back to relay on P2P send
failure instead of silently dropping messages.
Gap detection fix: SyncP2PReplay and TriggerReplayNow use EventID
matching instead of numeric index, fixing broken gap detection when
projection store exceeds its 1000-event cap.

Two root causes of messages not reaching mobile have been fixed:

sendViaTransport silently dropped messages on P2P send failure: The
function returned true even when DataChannel.Send() failed, causing
senderLoop to skip relay fallback. Now returns false to trigger relay
fallback — messages are never silently dropped.
Broken gap detection in SyncP2PReplay/TriggerReplayNow: Both
functions used relayHistoryCount (relay total, can be 2000+) as an array
index into the projection store capped at 1000 events. When
relayCount >= localCount, they concluded "no gap" and skipped sync. Fixed:
- SyncP2PReplay: uses relayLastEventID (Event ID string match) to find
  the suffix in projection events.
- TriggerReplayNow: replays ALL projection events (mobile deduplicates by
  EventID) instead of computing a broken suffix.

SetP2PNegotiating(true) called before handleRelayConnected runs recovery
plan, preventing relay replay from flooding mobile during P2P negotiation.
SyncP2PReplay() sends incremental missing events via DataChannel after P2P
establishes.
TriggerReplayNow() immediately replays missing events to relay after P2P
failure (not waiting for next reconnect).

signalCh race condition: Each Restart() creates a new channel + 5s
debounce to coalesce multiple confirmed as client events.
ICE timeout: Increased to 25s with SetICETimeouts(15s, 30s, 700ms) for
TURN/STUN tolerance behind GFW/CGNAT.
p2pDone channel: Replaces ctx.Done() for P2P active state — prevents
ICE timeout from killing an active P2P connection.
pion/webrtc logging: Redirected to debug.Log("webrtc", ...) via custom
LoggerFactory, preventing TUI corruption.
Standard log redirect: Third-party libraries using log.Printf are
redirected to debug.Log("stderr", ...).
countTokens debug spam: Removed excessive debug.Log calls from context
manager.

Updated docs/design/p2p-direct-connection.md from design proposal to actual
implementation reference, including architecture diagrams, protocol flow,
message loss prevention, and debugging guide.