fix(selftest): audit repo workflows with actionlint in selftest (closes #591)

[d-morrison]

Closes #591

⚠️ Stacked on #594 — merge that first.

Depends on: #594

WIP — opened up front to claim the issue; implementing now.

[d-morrison]

@claude review

[github-actions]

👀 Picked up by workflow run #32677559991. Setup runs first; Claude itself responds after that.

[d-morrison]

@claude review

[github-actions]

👀 Picked up by workflow run #32677622942. Setup runs first; Claude itself responds after that.

[github-actions]

Warning

No review ran --- this PR edits .github/workflows/_selftest.yml.
claude-code-action requires workflow files to match the default branch on dispatched runs, so its token exchange fails until this change merges.
The review is skipped by design, and re-running or re-dispatching will not change that: the skip lifts only if the PR stops editing that file.

require-review reports a gray skipped rather than green.
A green there attests that a reviewer ran, never that one approved; here none ran at all.
Merge on a self-review or a human review instead.

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