Use SKILL.md-only Figma catalogue

[Zochory]

Summary

• Remove duplicate SKILLS.md upload documents so each Figma skill ships as a single SKILL.md
• Drop sync_figma_documents.py, update init/validate/CI for the new layout, and expand the README catalogue
• Rebase onto current main (includes skill router + screenshot skill) and delete their leftover SKILLS.md files

Test plan

• uv run python scripts/validate_skills.py
• uv run python tests/test_skills_catalog.py
• uv run ruff check . && uv run ruff format --check .
• Confirm npx skills@latest add qredence/skills --list only shows skills/figma-agent/*/SKILL.md packages
• Spot-check README links for figma-skill-router and screenshot-to-component

[gemini-code-assist]

Code Review

This pull request simplifies the repository's structure by removing duplicate SKILLS.md files and establishing SKILL.md as the single source of truth for each Figma agent skill. It removes the synchronization script, updates the initialization and validation scripts, and adapts the test suite to enforce this new single-file convention. The review feedback suggests minor robustness improvements: adding defensive checks in the initialization script to verify the target path is a directory, using a more comprehensive .exists() check in the validation script for legacy files, and asserting the existence of the active skills root directory in the test suite to avoid unhandled errors.

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