docs: update validation workflow with new anti-hallucination tools

[himerus]

Summary

• Updates validation-workflow.md context file with styling_preflight and resolve_css_api tools
• Promotes styling_preflight as the recommended one-call CSS validation tool
• Adds resolve_css_api to the CSS validators table

Why

Agents read this context file to know which tools to call. Without these entries, agents won't discover the new anti-hallucination tools.

Test plan

• Context file is valid markdown
• No code changes

🤖 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: 24dcb136-62fd-4083-8148-2bf7b57eea69

📥 Commits

Reviewing files that changed from the base of the PR and between 09b9a98 and d3710c0.

📒 Files selected for processing (1)

• .automaker/context/validation-workflow.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/update-context-with-new-tools

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