chore: auto-review stacked PRs on non-default base branches

[nh13]

Add reviews.auto_review.base_branches: ['.*'] to .coderabbit.yaml so CodeRabbit also runs automatic reviews on PRs whose base is not the default branch (i.e. stacked PRs).

Without this, CodeRabbit only auto-reviews PRs based on the default branch (main) and skips every stacked PR with the notice: "Auto reviews are disabled on base/target branches other than the default branch." This is exactly what stalls stacked PRs like #447 (base feat-runall), which never receive a review.

base_branches accepts regex patterns and only adds branches to the default (the default branch is always reviewed); .* matches all base branches.

Note: CodeRabbit resolves .coderabbit.yaml from each PR's base branch, so existing stacked PRs only pick this up once their base branch (feat-runall, etc.) carries the change — rebase the stack onto main after this merges.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3800ca9e-7856-4890-92f9-1bb45a17c155

📥 Commits

Reviewing files that changed from the base of the PR and between 7adda90 and 76392e9.

📒 Files selected for processing (1)

• .coderabbit.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nh/chore-coderabbit-review-stacked-base-branches

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.04%. Comparing base (7adda90) to head (76392e9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #453   +/-   ##
=======================================
  Coverage   91.04%   91.04%           
=======================================
  Files          78       78           
  Lines       51324    51324           
=======================================
+ Hits        46729    46730    +1     
+ Misses       4595     4594    -1     

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