[jdx]

Summary

• define a versioned TaskCacheStore contract independent of the artifact manifest format
• move atomic filesystem lookup, staged publish, removal, and access-time updates into the local store implementation
• keep artifacts file-backed so future stores can transfer large payloads without buffering them in memory
• mark the cache-store interface item complete in the parity tracker

Validation

• cargo test --all-features task_cache_store::tests -- --nocapture
• task artifact cache E2E suite, including concurrency, corruption recovery, result-only entries, portability, limits, modes, and inspection
• mise run lint-fix
• cargo clippy --workspace --all-features --all-targets -- -D warnings

AI-assisted — Tool: Codex; model: unavailable/unavailable; version: unavailable.

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Note

Medium Risk
Touches core cache read/write/restore paths; behavior should match the prior inline FS logic, but regressions in concurrency, corruption handling, or result-only entries would affect task execution correctness.

Overview
Introduces a versioned TaskCacheStore trait (get, staged begin_write/commit, remove, touch) separate from the artifact manifest format, with LocalTaskCacheStore as the filesystem implementation (partial writes, atomic renames, access-time updates).

TaskArtifactCache now holds Arc<dyn TaskCacheStore> and routes restore, store, hit checks, and corrupt-entry cleanup through the store instead of hard-coded {key}.tar.zst / {key}.json paths. Artifacts stay file-backed on disk for streaming-friendly future backends.

Checksum verification accepts an optional archive path; a unit test covers verifying when the manifest already embeds the expected checksum. TASK_CACHE_PARITY.md marks the cache-store interface item done.

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[greptile-apps]

Greptile Summary

The PR extracts local task-cache persistence behind a versioned TaskCacheStore contract while preserving file-backed artifacts and existing manifest validation.

• Moves lookup, staged writes, commits, removal, and access-time updates into LocalTaskCacheStore.
• Routes cache restore, output inspection, and storage through the new trait.
• Replaces the previously reported debug-only compatibility assertion with a release-build runtime check.
• Marks the versioned cache-store interface parity item complete.

Confidence Score: 5/5

The PR appears safe to merge.

The previously reported release-build gap is fixed by an unconditional runtime version comparison in the sole TaskArtifactCache construction path, and no blocking failure remains.

Important Files Changed

Filename	Overview
src/task/task_cache.rs	Integrates the store abstraction throughout cache reads, restores, and writes, and now enforces the store version with a runtime error in all builds.
src/task/task_cache_store.rs	Defines the versioned store contract and local filesystem implementation with staged cleanup and atomic publication behavior.
src/task/mod.rs	Registers the new internal task-cache store module.
TASK_CACHE_PARITY.md	Records completion of the versioned cache-store interface milestone.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[github-actions]

Instruction counts

benchmark	trend	instructions	Δ	wall (min)	Δ
env	▃▅▂▁▁▂▅▄▄█	80,074,952 → 80,143,125	+0.09%	17.64 → 18.93ms	+7.28%
hook-env	▆▆▁▄▂▂▄▃▅█	82,190,914 → 82,280,490	+0.11%	18.34 → 19.63ms	+7.02%
ls	▅▃▁▁▁▆▆▆▅█	73,127,800 → 73,207,598	+0.11%	15.71 → 17.15ms	+9.15%
registry	▁▁▂▁▂▄▄▅▂█	49,102,713 → 49,264,395	+0.33%	11.64 → 12.66ms	+8.76%
startup	▃▃▁▃▂▁▂▂▃█	15,784,751 → 15,827,625	+0.27%	9.04 → 9.22ms	+2.05%

No instruction-count regression above 1%.

_{Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run.}

_{Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes.}

_{c1f88830be91 vs e5230aa14775 · measured on the runner, not pushed to the history.}