chore(ci): canonical fleet-standard workflows - #37

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Closing as superseded — fleet PR/Issue backlog sweep, 2026-08-11.

What this PR attempted: install the then-canonical fleet-standard workflow set.

Why it is being closed: it belonged to a fleet-wide sweep opened on 2026-06-19 (52 days ago) that was never merged in this repo. That subject has since been reworked by later generations of the same change — on the repos sampled, today's default branch already carries the intended shape, or has moved to the org-level reusable workflow entirely. The premise this PR was written against no longer describes this repo.

Nothing is deleted. Branch chore/standardize-workflows still holds every commit, and this PR can be reopened. An old PR assumes a codebase that has since moved, so re-doing this against today's default branch is faster and safer than rebasing a 52-day-old sweep.