# Review by Linus Torvalds (Round 1)

Here is my review:

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VERDICT: approve

FINDINGS:
- [src/colonyos/show.py]: Clean data/render separation. The dataclasses are simple and correct — no premature abstraction. `collapse_phase_timeline` is the most complex logic, and it's a straightforward linear scan with clear semantics. Good.
- [src/colonyos/show.py]: The `fix` and `else` branches in `collapse_phase_timeline` (lines 260-286) are nearly identical — 12 lines duplicated with only `phase_name` vs `"fix"` differing. This is a minor annoyance, not a blocker; collapsing them into the `else` branch would be cleaner since `fix` isn't special in terms of data construction, only in being a non-review phase. The "fix starts a new round" semantic is already handled by the fact that fix breaks the review contiguity.
- [src/colonyos/show.py]: `resolve_run_id` uses substring matching (`partial_id in run_id`) which is broader than the PRD's "prefix matching on run ID and substring matching on hash suffix." The current implementation would match `120000` anywhere in the filename, not just the hash suffix. For this use case it's pragmatic and won't cause real problems, but it's technically looser than spec.
- [src/colonyos/show.py]: `validate_run_id_input` correctly guards against path traversal. The regex `[/\\]|\.\." is compiled once at module level. Correct.
- [src/colonyos/cli.py]: The `show` command is wired cleanly. Lazy imports inside the function body keep startup fast. Error handling covers all three cases (not found, validation error, ambiguous) with proper stderr output and non-zero exit codes.
- [tests/test_show.py]: 51 tests covering all data-layer functions and render smoke tests. Good test-to-code ratio. Tests are readable, use `tmp_path` correctly, and don't mock internals unnecessarily.
- [tests/test_cli.py]: CLI integration tests cover the full matrix: exact match, prefix, bad ID, ambiguous, `--json`, and `--phase`. The `--json` test actually parses the output — good.
- [src/colonyos/show.py]: No secrets, no file writes, no network calls. Pure computation + rendering. The attack surface is essentially zero.

SYNTHESIS:
This is solid, workmanlike code. It does one thing — load a JSON file, crunch some numbers, print a table — and it does it correctly. The data/render split is clean and makes `--json` trivial, which is the right trade-off even if I'd normally argue for simplicity. The review-collapsing logic is the one piece of real algorithmic work, and it's a simple linear scan that's easy to reason about. All 865 tests pass with zero regressions. The only nit worth mentioning is the duplicated `fix`/`else` branches in `collapse_phase_timeline` — the `fix` branch does nothing special compared to the generic case and could be folded in. But that's a style preference, not a correctness issue. Ship it.