feat(review): skip auto-review when a configured label is present via review.auto_review.skip_labels

[JSONbored]

Part of #1954. Add review.auto_review.skip_labels (list, e.g. wip, do-not-review) so a PR carrying any configured label is skipped by the review path. Deterministic label-name match; default empty ⇒ no skips. Complements ignore_title_keywords for teams that gate via labels.

Deliverables

• Parse skip_labels as a bounded, deduped, lowercased string list in parseReviewConfig (src/signals/focus-manifest.ts:653); serialize in reviewConfigToJson
• Add a label branch to decideReviewEligibility (src/review/review-eligibility.ts): skipReason="skip_label" when any PR label matches (case-insensitive)
• Thread the PR's current labels into the eligibility call at maybePublishPrPublicSurface (src/queue/processors.ts:4533)
• Unit tests: matching label ⇒ skip, no match ⇒ eligible, empty list ⇒ eligible, case-insensitive match, no-labels PR; 97% branch

References

• src/queue/processors.ts:4533
• src/review/review-eligibility.ts
• src/signals/focus-manifest.ts:653
• #1954

Part of #1954.

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size: S · gittensor:feature

[linear-code]

JSO-2179