cid(review): PASS — bench_sum_code completes all 10 gen_*_v0 benchmarks

Author: CID Agent

.claude/agent-memory/review/MEMORY.md

@@ -181,6 +181,14 @@ Review patterns, quality gate knowledge, and common issues accumulated across CI
     `cd crates/iscc-py && uv run maturin develop --release` to build the Python extension. This is a
     one-time setup per container/checkout
 
+## Benchmark Review
+
+- `NamedTempFile` wraps unbuffered `std::fs::File` — no explicit flush needed after `write_all`.
+    `File::open` in Rust uses shared access on Windows, so concurrent read-while-write-handle-open
+    works. Codex false-positive about Windows exclusive access can be dismissed
+- `group.throughput()` called per-size within the same benchmark group is the established pattern in
+    this codebase (used by `bench_data_code`, `bench_instance_code`, and now `bench_sum_code`)
+
 ## Gotchas
 
 - Git log shows iteration numbering resets when a new CID run starts (iteration 12 → iteration 1) —

.claude/context/handoff.md

@@ -1,31 +1,39 @@
-## 2026-03-02 — Add bench_sum_code criterion benchmark for gen_sum_code_v0
+## 2026-03-02 — Review of: Add bench_sum_code criterion benchmark for gen_sum_code_v0
 
-**Done:** Added the `bench_sum_code` criterion benchmark function for `gen_sum_code_v0`, completing
-all 10 `gen_*_v0` benchmarks. The benchmark writes deterministic data to temp files (64KB and 1MB)
-and measures throughput, matching the pattern used by `bench_data_code` and `bench_instance_code`.
-Added `tempfile` as a workspace and dev-dependency.
+**Verdict:** PASS
 
-**Files changed:**
-
-- `crates/iscc-lib/benches/benchmarks.rs`: Added `gen_sum_code_v0` import, `std::io::Write` and
-    `tempfile::NamedTempFile` imports, `bench_sum_code` function with 64KB/1MB throughput
-    benchmarks, registered in `criterion_group!`, updated docstring from "9" to "10"
-- `crates/iscc-lib/Cargo.toml`: Added `tempfile = { workspace = true }` to dev-dependencies
-- `Cargo.toml`: Added `tempfile = "3"` to workspace dependencies
+**Summary:** The advance agent added the 10th and final `gen_*_v0` criterion benchmark
+(`bench_sum_code`) with two throughput measurements (64KB and 1MB), matching the existing pattern
+from `bench_data_code` and `bench_instance_code`. The `tempfile` crate was correctly added as a
+workspace dev-dependency. Implementation is clean, correctly scoped, and all verification criteria
+pass.
 
 **Verification:**
 
-- `cargo bench -p iscc-lib --bench benchmarks --no-run` — exits 0 (compiles)
-- `grep -c 'gen_sum_code_v0' crates/iscc-lib/benches/benchmarks.rs` — returns 5 (≥2 required)
-- `grep 'all 10' crates/iscc-lib/benches/benchmarks.rs` — matches updated docstring
-- `cargo clippy -p iscc-lib -- -D warnings` — clean
-- `cargo test -p iscc-lib` — 310 tests pass (256 + 31 + 22 + 1 doctest)
-- `mise run check` — 14/14 hooks pass
+- [x] `cargo bench -p iscc-lib --bench benchmarks --no-run` exits 0 — compiles in 44s
+- [x] `grep -c 'gen_sum_code_v0' crates/iscc-lib/benches/benchmarks.rs` returns 5 (≥2 required)
+- [x] `grep 'all 10' crates/iscc-lib/benches/benchmarks.rs` — matches updated docstring
+- [x] `cargo clippy -p iscc-lib -- -D warnings` — clean
+- [x] `cargo test -p iscc-lib` — 310 tests pass (256 + 31 + 22 + 1 doctest)
+- [x] `mise run check` — 14/14 hooks pass
+
+**Issues found:**
+
+- (none)
+
+**Codex review:** Codex raised a concern about `NamedTempFile` keeping the file handle open on
+Windows, potentially causing exclusive access issues when `gen_sum_code_v0` tries to read the file.
+This is not an issue in practice: Rust's `std::fs::File::open` uses shared access modes on Windows,
+and `NamedTempFile` wraps an unbuffered `File` (no flush needed). The throughput pattern
+(`group.throughput()` called per-size) was also questioned but matches the existing
+`bench_data_code` and `bench_instance_code` patterns exactly. No actionable findings.
 
-**Next:** All 10 `gen_*_v0` benchmarks now exist. The target requirement for criterion benchmarks is
-fully met. The next update-state should evaluate whether all target.md criteria are satisfied — this
-may be the final gap before target completion.
+**Next:** All target.md sections should now be fully met (Benchmarks was the last gap). The next
+update-state should confirm this. Only issue #16 (feature flags for minimal builds, low priority)
+remains as tracked work. The project may be approaching target completion — the next iteration
+should verify all criteria are satisfied and consider whether to close out the target or move to
+issue #16.
 
-**Notes:** The `tempfile` crate (v3) was the only new dependency added. Temp files are created
-outside the benchmark closure so file I/O setup isn't measured. The `NamedTempFile` handles cleanup
-automatically. No surprises during implementation.
+**Notes:** The `tempfile` crate (v3) was the only new dependency. The benchmark correctly creates
+temp files outside the criterion closure so file I/O setup isn't measured. `NamedTempFile`
+auto-cleans up via `Drop`. No regressions, no scope creep, no quality gate issues.

.claude/context/iterations.jsonl

@@ -619,3 +619,7 @@
 {"ts":"2026-03-02T03:06:47.562005+00:00","iteration":5,"role":"update-state","status":"OK","turns":30,"cost_usd":0.944265,"duration_s":251.7}
 {"ts":"2026-03-02T03:10:08.796259+00:00","iteration":5,"role":"define-next","status":"OK","turns":20,"cost_usd":0.881627,"duration_s":201.2}
 {"ts":"2026-03-02T03:13:35.319908+00:00","iteration":5,"role":"advance","status":"OK","turns":37,"cost_usd":1.213391,"duration_s":206.5}
+{"ts":"2026-03-02T03:20:27.369900+00:00","iteration":5,"role":"review","status":"OK","turns":60,"cost_usd":1.725231,"duration_s":412.0}
+{"ts":"2026-03-02T03:43:19.676640+00:00","iteration":6,"role":"update-state","status":"OK","turns":27,"cost_usd":0.859564,"duration_s":255.6}
+{"ts":"2026-03-02T03:45:47.035510+00:00","iteration":6,"role":"define-next","status":"OK","turns":17,"cost_usd":0.541852,"duration_s":147.3}
+{"ts":"2026-03-02T03:51:15.330031+00:00","iteration":6,"role":"advance","status":"OK","turns":34,"cost_usd":1.013403,"duration_s":328.3}