Both halves are right, and shipping them together is justified: the ladder dropping `pipeline` first threw away the upstream answer while keeping a prompt it already had a copy of, and `resolvePreviousResponseState` rebuilds continuation history out of exactly that field. The detail-panel fix has to ride along because the size-limit placeholder is a non-empty string, so fixing the ladder alone would let it overwrite a good payload. Re-checking emptiness per side after reading is the actual bug — `responseBody` being one value for both sides is what let a provider payload show as the client response.
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Validated in one consolidated worktree cut from `release/v3.8.51`, boarded together with the rest of this batch — zero conflicts between them.
- `typecheck:core` clean; `check:changelog-integrity` OK
- complexity 2799 / baseline 3218 and cognitive-complexity 1265 / baseline 1437 — both under baseline
- 86 focused assertions green across the batch's 10 unit test files, plus 16/16 on the v1 plugin option schema and 16/16 on the v2 option tests
- `check-file-size` rebaselined for this batch's real growth (annotation `_rebaseline_2026_09_11_mergebatch_v3851_maxmad_opencode`, landed on #13141). `open-sse/utils/stream.ts` was deliberately left frozen: it is already 3115 > 3098 on the pure tip with zero contribution from this batch.
⚠️ base-red inherited: #12732 — `Docs Gates`, `Merge integrity`, `No new ESLint warnings`, `Unit Tests fast-path` and `Fast Quality Gates` all reproduce on the pure `release/v3.8.51` tip (provider count 356 vs the 358 the modules define, SKILL.md drift, and the `stream.ts` freeze above). None of them touch these diffs.
Thanks @maxmad64bis.
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