ci(version): replace [skip ci] with [auto-version] on bump commits

[namastex888]

Closes #1139.

Problem

Version-bump commits use GitHub's [skip ci] marker to prevent the Version workflow from re-triggering on its own output. Side effect: GitHub suppresses all workflow runs on those commits — including the CI and Commitlint checks that PR #1124 (rolling promotion dev→main) needs in its status rollup. Every single version bump stales the rollup, requiring manual intervention (empty retrigger commits, close+reopen attempts) to unblock the rolling PR.

Observed three times in 24 hours on 2026-04-11:

• 235d3ad9 (4.260411.3 [skip ci]) — staled rollup after fix(omni-bridge): isolate GENIE_HOME in tests + arm idle timer last #1138 merge
• 22bc0270 (4.260412.1 [skip ci]) — staled rollup after metrics commit
• Required manual d7372252 → 6e38a17a empty-commit push to retrigger

Fix

Replace [skip ci] with a custom [auto-version] marker in two places in version.yml:

Line	Before	After
26 (guard)	!contains(message, '[skip ci]')	!contains(message, '[auto-version]')
99 (commit)	bump to ${VERSION} [skip ci]	bump to ${VERSION} [auto-version]

How it works:

1. Version bump commits now say [auto-version] — GitHub does not recognize this as a CI-skip marker, so CI + Commitlint fire normally on dev push.
2. Those CI completions trigger the Version workflow, but it checks !contains(head_commit.message, '[auto-version]') → false → self-guards. No infinite loop.
3. PR chore: rolling promotion dev -> main #1124's rollup always reflects the latest commit's Quality Gate + Commitlint state. No manual retrigger needed.

Cost: one extra ~60s CI run per version bump on the Blacksmith runner. Marginal vs the manual-intervention tax it eliminates.

Not touched: release.yml's guard (!startsWith(message, '[skip ci]')) — it protects against a different edge case (direct [skip ci]-prefixed pushes to main) and version bumps are always pushed to dev, never directly to main.

Test plan

• Merge this PR → Version workflow fires → emits [auto-version] bump commit
• CI fires on the [auto-version] bump commit (previously would not fire)
• Version workflow sees the [auto-version] CI completion and skips (no infinite loop)
• PR chore: rolling promotion dev -> main #1124's rollup shows Quality Gate + Commitlint on the bump commit
• No manual retrigger needed for next rolling promotion

🤖 Generated with Claude Code

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