fix(transport): prevent SSE replay storms and silent message loss - #396

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fix/sse-delivery-regression

Commits on Jul 4, 2026

fix(transport): prevent SSE replay storms and silent message loss

dimakis
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claude
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af52982
fix: address Centaur review findings on SSE delivery PR

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claude
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3ffbcc5
fix: address second Centaur review — transient-only retries, dedup enqueuePending

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claude
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ac0d4be
fix: address third Centaur review — retry budget, CLOSING sync, compat test

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claude
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228abe2
fix: add 429 retry, sequential flush ordering for SSE sends

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claude
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87301ac
fix: await flush before _open, retry permission POSTs, add 429

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claude
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9cbb821
fix: add flush guard against concurrent flushes, retry exhaustion test

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6ac2360
fix: replace _flushing boolean with promise to prevent concurrent flush race

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2322984
fix: drain re-queued sends after flush, rename MAX_SEND_ATTEMPTS

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7c5d29b