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Behind `STREAM_RECOVERY_TOOLCALL_ORDER_FIX` (default off), mid-stream continuation becomes tool-call safe: any tool call seen in the stream — in flight or finished — blocks a continuation, and an empty continuation stops after one attempt.
Maintainer rework before merge (kept the idea, no default behavior change):
- The empty-continuation short-circuit also ran with the flag off; it is now gated, so the flag-off path uses the whole budget exactly as before (regression test added).
- The latch re-arm that let a continuation fire after a completed `finish_reason: tool_calls` is gone; index-less tool calls on multi-choice payloads are now blocked too; ~150 lines of dead trace plumbing removed.
Validated first on the combined board of all 38 PRs of this batch (10 merged as-is, 28 after the maintainer rework) on top of release/v3.8.51 c0f92ec: typecheck:core, check:open-sse-typecheck and check:dashboard-typecheck clean; ESLint clean on every changed file; file-size (rebaselined for the combined growth), complexity, cognitive-complexity, changelog-integrity, docs-counts, docs-sync, migration-numbering and i18n new-key gates green; 735 focused node:test cases with the only batch-caused failure (a flag-count assertion) fixed. Then re-validated alone on the fresh release tip right before this merge: ESLint on the changed files, typecheck:core, check:open-sse-typecheck, the file-size/complexity/changelog gates and this PR's own tests.
Thanks @maxmad64bis!