fix: exclude skill JS files from Biome linting

[cblecker]

Summary

• Adds biome.jsonc to exclude **/skills/**/*.js from Biome analysis
• Fixes CodeRabbit false positive: "Illegal return statement outside of a function" on pr-review-toolkit/skills/review-pr/review-pr.js
• Claude Code skill .js files are evaluated as function bodies where top-level return is valid, but Biome parses them as standalone modules

Test plan

• Verify biome.jsonc is valid JSON
• Confirm CodeRabbit no longer reports Biome syntax errors on PRs touching skill JS files

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 8bc018a5-4ed6-410b-a750-190b576352c2

📥 Commits

Reviewing files that changed from the base of the PR and between 39a04cc and 3edf777.

📒 Files selected for processing (1)

• biome.jsonc

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/biome-skill-js-ignore

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[Copilot]

Pull request overview

This PR adds a root-level biome.jsonc to exclude Claude Code skill JavaScript files (**/skills/**/*.js) from Biome analysis. The goal is to suppress a CodeRabbit/Biome false positive ("Illegal return statement outside of a function") on pr-review-toolkit/skills/review-pr/review-pr.js, which is a Claude Workflow script (evaluated as a function body where top-level return is valid) rather than a standalone module. This mirrors existing exclusion patterns already used for skill content in .skillsaw.yaml, .markdownlint-cli2.jsonc, and .coderabbit.yaml, though with a broader glob.

Changes:

• Adds a new biome.jsonc at the repository root pinned to the Biome 2.0.6 schema.
• Configures an exclusion so skill .js files are not linted by Biome.

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