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Charlie Marsh
b7ca29d25b
## Why A fork's inherited history can become unreadable when the preferred ancestor rollout is truncated or has an incomplete compressed frame, even when a usable archived copy exists. ## What changed - Retry failed ancestor reads using another copy of the same rollout, validating its owner and location before rebuilding the lineage. - Apply fallback to model-context loading, fork and revert preparation, and paginated history reads. Preserve the original error when no usable replacement exists. - Validate inherited byte offsets when opening ancestors for consumption, allowing a newer model-context checkpoint to avoid reading an unusable ancestor. - Limit ancestor materialization to the inherited history boundary while preserving any existing progress beyond it. ## Testing Add regression coverage for incomplete compressed ancestors, replacement ownership checks, archived-copy recovery during resume and fork, and materialization boundaries. Add an app-server test that cold-resumes a fork and pages inherited turns and items from an archived copy when the active ancestor is too short. GitOrigin-RevId: 43730c17329ac759f7292b16ddf0d9eb463e3310