[Maximooch]

Stacked on Support validated image and embedded context in ACP (#137). Rewriting the entire native session for each streamed text chunk scales quadratically with conversation length. This appends visible updates to per-session NDJSON journals and checkpoints native model state at turn boundaries. Existing metadata transcripts migrate on their next append. Interrupted final writes recover to the last complete record; malformed committed records still fail closed. The full replay is sent only to the client, never injected into model context.

Validation: 37 aggregate ACP tests pass, including a 2,000-chunk regression asserting linear journal size and zero native session rewrites while streaming, partial-tail recovery, continued appends, native core continuation after restart, and a new-session request queued behind an active turn/checkpoint. Scoped Ruff and diff checks pass.

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Project	Deployment	Actions	Updated
penguin	Ready	Preview	Oct 28, 2026 5:05am UTC

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[Maximooch]

Integrated with preserved commit history through #161 (main commit abd8a66). Closing this stacked review after verifying its current head is an ancestor of main.