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Adds an immutable per-commit docker tag to every main-push build:
`git.fabledsword.com/bvandeusen/fabledcurator{,-ml}:c-<short_sha>`,
alongside the existing floating `:main` + `:latest`. Implements the
new family release-posture rule "Tags are milestones, not gates —
commit-SHA images are the rollback unit" so rollback to any commit
on main is `docker pull …:c-<sha>` with no release ceremony required.
Behavior change summary:
- main-push: was {:main, :latest} → now {:main, :latest, :c-<short_sha>}
- tag-push (opt-in vYY.MM.DD only, no .N): unchanged
- safety-net dev: unchanged
No code changes; the rule is about how the tag list is constructed.
Tag-push workflows stay as-is — vYY.MM.DD milestone cuts can still
fire them when the operator wants a labeled checkpoint.