The #94219 replay was a production no-op: the server returned full
JSON-RPC envelopes from session.events.since while the client's replay
loop dispatches only elements with a top-level 'type' — every replayed
event was silently skipped. Each side's tests validated its own
assumption, so both suites stayed green.
- server: events_since() now returns bare event objects (the frame's
params), the exact shape the live dispatch path consumes; ring stores
params directly; cross-language contract test added on both sides.
- client: live frames racing an in-flight replay are parked and flushed
seq-gated afterward — no double dispatch of deltas, no gap-skip from
a watermark advanced past the replay window.
- restart poisoning: seq counters are in-process, so a backend restart
reset them while clients kept high watermarks (replay forever empty,
truncated=false). New replay_epoch advertised in gateway.ready and
echoed by session.events.since; the client clears watermarks on epoch
change.
- methods_session no longer reaches into event_replay privates
(is_truncated() accessor).
Live repro: pre-fix, 3 stamped frames -> 0 dispatchable by the client
gate; post-fix 3/3. Tests: 16 py (replay+ws), 8 vitest, tsc clean, ruff
clean.
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