{"answer":"Checked every changed file in `pr/` against the diff: `sweep.rs`, `metrics.rs`, `config.rs`, `main.rs`, `routes/mod.rs`, `routes/admin.rs`, `store.rs`, `digest.rs`, `Cargo.toml`s, and both docs. The concrete defects found:\n\n🔴 `bug` services/proxy/src/sweep.rs:224: `clear_partials` unconditionally unlinks every file in `incoming/`, but `BlobStore::writer` (store.rs:171) and `link` (store.rs:147) keep *in-progress* fetches and index temp writes in that same directory — the doc claim \"a file in `incoming` is a fetch that is not coming back\" is false, so any sweep concurrent with a download (every 15 min via `spawn_sweeps`) deletes the partial out from under the writer and the fetch fails at `commit`'s rename\n\n🟠 `bug` services/proxy/src/routes/admin.rs:76: `reclaim` calls `app.sweeper.sweep(dry_run)` directly, bypassing the `running` mutex that only `Sweeper::run` acquires (sweep.rs:83) — the module's own one-at-a-time invariant (sweep.rs:10) is broken, so a concurrent manual sweep and interval sweep each compute removals from a total the other is changing and jointly delete the store far below the ceiling\n\n🟠 `performance` services/proxy/src/routes/admin.rs:76: `sweep(dry_run)` is fully synchronous (`fs::read_dir`/`fs::metadata`/`fs::read`/`fs::remove_file` over the entire store) yet runs directly in the async handler and in the spawned loop in main.rs:116 — it blocks a Tokio worker thread for the whole duration of a multi-second walk of a large store, stalling unrelated requests the worker was driving\n\n🟡 `bug` services/proxy/src/metrics.rs:94: `values()` returns `sweep_bytes_reclaimed` then `sweep_blobs_removed`, but `COUNTERS` declares `cairn_proxy_sweep_blobs_removed_total` (line 51) before `cairn_proxy_sweep_bytes_reclaimed_total` (line 55) — the positional zip in `render` (line 107) swaps the two, so every scrape exports the blob count under the bytes name and the byte count under the blobs name, silently breaking the `cairn_proxy_sweep_bytes_reclaimed_total` alerting docs/operations.md now prescribes\n\n🟡 `bug` services/proxy/src/sweep.rs:102: eviction candidates are sorted by *ascending* `age` (\"oldest first\" per the comment, but ascending age is newest-first), and combined with the loop at line 119 removing while `remaining >= max_bytes`, the sweep deletes the most recently fetched blobs first and stops before touching the actually-oldest ones — the exact opposite of the stated LRU intent\n\n🟡 `bug` services/proxy/src/sweep.rs:160: the comment says a symlink \"is counted at the size of the link\", but line 164 uses `fs::metadata`, which follows links — a symlinked blob is counted at its target's size while line 126's `fs::remove_file` removes only the link, reclaiming no bytes, so `remaining`/`bytes` are inflated and the sweep reports and stops on numbers that do not match what was freed\n\n🔵 `bug` services/proxy/src/sweep.rs:134: `remaining` is decremented and `bytes`/`removed` incremented even when the `fs::remove_file` at line 126 failed (the error is only logged at debug), so a blob that could not be deleted is treated as reclaimed — the reported totals and the stop condition diverge from what is actually 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