smithy: unzip missing on rust-cpu runners blocks claude-code-action

[avrabe]

Summary

Self-hosted rust-cpu runners (pulseengine-ci-01-{5,6,7,9,10,11,12}) lack unzip, which oven-sh/setup-bun requires to extract the bun binary. This blocks anthropics/claude-code-action from running, which in turn blocks meld's mythos-auto.yml (#162) from completing its scan matrix.

Observed

PR #163 (first end-to-end run): scan job ran with the runner attempting setup-bun → fail at Unable to locate executable file: unzip → action's bun-based entrypoints exit 127 → placeholder-FINDING fallback fires → workflow fails.

PR #166 (second attempt, after mythos-auto.yml plumbing fix in #164): same unzip error, same cascade. My in-workflow apt-get install -y unzip attempt also fails (probably apt-get update issue or sudo perms — exit code 1).

Concrete log snippet:

##[error]Error: Unable to locate executable file: unzip. Please verify either the file path exists ...
/var/lib/runners/runner5/_work/_temp/.../d9f8a6f8.sh: line 3: bun: command not found
##[error]Process completed with exit code 127.

Impact

The mythos-auto.yml workflow (the AI-driven Mythos discover-protocol auto-runner shipped in #162) cannot complete its matrix scan until unzip is available on rust-cpu runners. Every Tier-5 PR by avrabe will trigger this failure cascade.

Asks

1. Install unzip in the rust-cpu runner image (or via post-provisioning script). It's a 200KB Debian package; cost is trivial.
2. Alternative: provide a pre-installed bun binary at a known path so workflows can pass path_to_bun_executable to claude-code-action and skip setup-bun entirely.

Workaround for now

mythos-auto.yml falls back to a FINDING placeholder when structured output is empty; PR-time mythos-pass-done label must be applied manually until this is resolved. The label-only mythos-gate.yml (#151) is unaffected — that gate just checks for the label.

References

• Smithy fleet reliability — rolling tracker (meld side) #139 §3 (per-runner config drift) — same family of bug, different package
• PR feat(ci): Mythos delta-pass auto-runner (single-actor, OAuth-token) #162 (mythos-auto.yml introduction)
• PR fix(ci): mythos-auto plumbing — slug ordering, unzip install #164 (mythos-auto.yml plumbing fixes; tried in-workflow apt-get install unzip but the install step itself exits 1)
• PR test(merger): add LS-A-19 regression for exact resource-import lookup #163 first end-to-end attempt logs: https://github.com/pulseengine/meld/actions/runs/25984380642
• PR test(fact): LS-A-9 regression for callback POLL dispatch #166 second attempt logs: https://github.com/pulseengine/meld/actions/runs/26076695595

[avrabe]

Fixed. unzip is now installed on the runner host
(/usr/bin/unzip present on pulseengine-ci-01) and added to
ansible base_packages in group_vars/all.yml so it survives
re-provisioning. All 7 rust-cpu runners now have it.

The Mythos auto-runner should work on the next mythos-auto.yml
dispatch — no PR action needed on your side, just rerun the failed
scan job.

Closing.