feat: SBE v7 egressSeq — log-position order key on trade + status egress#119
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…ess (Layer 2, match side) Stamps every OrderStatusBatch/TradeExecutionBatch entry with the Aeron cluster-log position of the producing ingress command (header.position() -> Engine.currentLogPosition, the bookVersion source): deterministic across replicas, monotonic across leaders, shared by all events of one command. Gives consumers one order key spanning both egress streams (which flush trades-before-statuses). ORDER KEY ONLY, and documented as such in the schema: the log position is sparse (timers advance it) and non-unique (per command, not per event) -- statusSeq/tradeId remain the dense gap-detect sequences. Group TAIL extension sinceVersion=7; mixed-roll safe (v6 peers skip via group blockLength, v7 readers of v6 streams get the null value -> normalize to 0). Determinism goldens unchanged (egressSeq invisible to the logical MatchEventSink): corpus 67/0. Publisher/encoder tests 45/0. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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