- db.ts: restrict migration-105 orphan-step cleanup to JSON arrays
(json_type guard so json_each can't expand objects/strings)
- project-engine.ts: requestInterpreterMerge throws on null task lookup
instead of casting null into MergeResult (seam converts to clean failure)
- executor.ts: truncate dual-observe shadow stage walk at the live terminal
stage so healthy in-review tasks don't record a phantom merge transition
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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