- Build runtime history per turn: a cancelled or failed reply keeps its partial
text plus an interruption marker (or a marker-only placeholder), so its user
message is never left unanswered and merged into the next request.
- Use the same history for send, manual compaction and Main compact validation.
- OpenCode: keep a cancelled prompt in the reused native session and prefix the
next turn with a one-time synthetic interruption notice; failed prompts are
still removed.
- Add an opt-in DeepSeek live test covering direct model and OpenCode.
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