ci: make caller review skill optional

[robbycochran]

Makes the reusable PR-review workflow use the bundled review skill when callers do not provide a skill path, while preserving caller skill overrides.

Summary by CodeRabbit

• Improvements
  • Pull request reviews now use the trusted default review configuration automatically.
  • Custom review configurations remain available as an optional override for projects that need specialized checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 274ecfe5-1155-4ead-9da3-9afcdf4d6471

📥 Commits

Reviewing files that changed from the base of the PR and between e7e623d and f420062.

📒 Files selected for processing (1)

• .github/workflows/pr-review-reusable.yml

Included review availability: Your plan provides up to 12 included reviews per hour; 8 remain after this review.

---

Walkthrough

The reusable PR review workflow now installs Harness’s trusted default skill and only installs a caller-provided skill when skill-path is non-empty.

Changes

Review skill installation

Layer / File(s)	Summary
Workflow skill resolution .github/workflows/pr-review-reusable.yml	The skill-path input now defaults to an empty value. The workflow installs the Harness default skill and conditionally installs a caller-provided skill.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to f4200

The workflow now uses the bundled review skill by default while retaining explicit caller overrides. No current merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: making the caller-provided review skill optional while allowing the bundled skill to remain the default.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch workflow-optional-skill

---

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