Three fixes for the remote rebuild path:
1. Base-only completion: when BaseLSN == TargetLSN, the base image covers
all data — no WAL tail needed. MarkBaseComplete now auto-satisfies the
WAL condition and calls TryComplete so the session completes immediately
after the base transfer finishes.
2. Base lane protocol handshake: runBaseLaneClient now sends MsgRebuildReq
{Type: RebuildSessionBase} before reading. The RebuildServer requires
this handshake to dispatch to ServeBaseBlocks. Without it, the server
received raw frames it couldn't understand.
3. Direct ack events: OnAck emits engine events directly (SessionCompleted,
SessionProgressObserved, SessionFailed) instead of routing through
ObserveReplicaRebuildSessionAck which requires the sender in the
orchestrator registry. The remote coordinator owns the session — no
registry lookup needed.
Also adds diagnostic logging on both sides:
- Replica: logs parsed RebuildAddr and base lane client start
- Primary: logs sender state after installSession
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
pingqiuandClaude Opus 4.6
55862f1ab1