Fix CodeRabbit label-gate override not binding

[groupthinking]

Disable config inheritance in .coderabbit.yaml so reviews.auto_review.labels: [] actually clears the inherited required-label gate and auto-review resumes.

[linear-code]

GRV-411

[github-actions]

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[groupthinking]

Duplicate of #1424 (CodeRabbit auto-review never fires: inherited label gate deadlocks against auto_apply_labels), which is still open and tracks this exact fix — setting reviews.auto_review.labels explicitly in .coderabbit.yaml so the inherited required-label gate no longer applies. The earlier fix attempt (#1425) was reopened per #1482's review finding that labels: [] doesn't actually clear the inherited gate, which is the same root cause described here. Closing as a duplicate; further work should happen on #1424.

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