feat(skills): Add pf-token-auditor skill

[lboehling]

Summary

This skill solves the 'handoff gap' by allowing your ai agent to read styles & variables applied in live Figma layers via MCP and cross-reference them with the src/patternfly/base/tokens directory. It identifies incorrectly used base tokens/hex/px values and suggests contextually appropriate semantic token alternatives, translates pixel-based 'figma-only' variables into the corresponding code tokens as defined in our local tokens scss file, reconstructs complex CSS properties (like box-shadows) into their appropriate PatternFly composite tokens, and identifies any token discrepancies between the figma styles and existing component implementation.

• Adds new pf-token-auditor skill to plugins/pf-react/skills/ for validating and bridging Figma design styles to PatternFly 6 design tokens
• Includes SKILL.md with full audit workflow (Figma variable extraction, token classification, naming validation, theme awareness, drift detection, and handoff generation)
• Includes token-reference.md with comprehensive PatternFly token category reference

Test plan

• Verify SKILL.md renders correctly and relative link to token-reference.md resolves
• Confirm skill triggers on expected user mentions (e.g. "token audit", "Figma variables", "design tokens", "PF tokens")

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