Run closed-bug-regression-audit over the 91 closed bugs

**What** — `closed-bug-regression-audit` was deferred, not skipped, during the 2026-08 repo improvement sweep. It has never run against this repo's 91 closed bug issues.

**Why it matters here** — 91 closed bugs is the largest regression-audit surface of the six repos swept, and the only one where the lens produces signal at all; the other five have zero closed bug issues. It was deferred because a full 3-pass parallel-subagent run does not belong in a corner of a config-and-docs sweep, not because the surface is uninteresting.

The repo has the shape that makes this productive: 695 commits, 45 contributors, 30 published releases, 151 test files against 283 source files, and a `pytest.yml` that runs on every PR. A bug that was fixed without a regression test can silently come back through any of those 45 contributors.

There is a specific reason to think the yield is non-zero. `comfy_cli/utils.py` shipped a knowingly-unfiltered `tar.extractall()` for the entire period cpython#107845 was open, with no test covering extraction safety either way — the regression test that proves it now only exists because of Comfy-Org/comfy-cli#734, filed by this same sweep. Gaps of that shape are what the lens looks for.

**Evidence**

```
$ gh issue list -R Comfy-Org/comfy-cli --state closed --label bug --limit 100 --json number -q 'length'
91

$ gh issue list -R Comfy-Org/comfy-cli --state open --label quality:missing-regression-test --json number -q 'length'
0
```

**Fix**

Run the lens: `skills/closed-bug-regression-audit/SKILL.md`. It uses a 3-pass parallel-subagent strategy (keyword, adversarial, fix-PR-diff, systemic-pattern) and files gap issues under `quality:missing-regression-test`.

Per the sweep's shared schema, apply the sweep labels alongside the native one so the results stay queryable with the rest of the sweep backlog.

Dedupe first — this repo already has sweep issues filed:

```
bash skills/repo-improvement-sweep/scripts/existing-findings.sh Comfy-Org/comfy-cli
bash skills/repo-improvement-sweep/scripts/in-flight-work.sh Comfy-Org/comfy-cli
```

Note the repo currently has 13 open PRs, several long-lived — check against those before filing anything.

---

Deferred from repo improvement sweep 2026-08-17. Parent: #723