feat: add resolve_css_api anti-hallucination tool

[himerus]

Summary

• New resolve_css_api MCP tool that validates every ::part(), CSS custom property, and slot reference against actual CEM data
• Returns structured report: valid/invalid status per reference, fuzzy-match suggestions for typos, and full component API surface summary
• Catches hallucinated part names, invalid token names, and unknown slot names before agents ship broken CSS

Anti-hallucination impact

When agents call resolve_css_api before finalizing CSS, they get immediate feedback on whether ::part(content) actually exists on sl-dialog (it doesn't — the valid parts are base, overlay, panel, header, body, footer, etc.)

Test plan

• 20 tests covering part resolution, token resolution, slot resolution, typo suggestions, deduplication, bare components
• TypeScript compiles clean
• ESLint passes

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 81676de3-3a9d-47a3-89e1-9f37647d1662

📥 Commits

Reviewing files that changed from the base of the PR and between d294078 and 9b96f43.

📒 Files selected for processing (4)

• .changeset/css-api-resolver.md
• packages/core/src/handlers/css-api-resolver.ts
• packages/core/src/tools/styling.ts
• tests/handlers/css-api-resolver.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/css-api-resolver

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