feat: add react-hook-philosophy plugin

[kimyouknow]

Summary

Initial draft of react-hook-philosophy as a Claude Code plugin, defining 31 hook design principles for code review and writing guidance.

• 31 principles: C1-C14 (coding principles from CLAUDE.md) + U1-U17 (usage patterns from react.dev)
• 2 skills: react-hook-review (checklist) + react-hook-writing (guide)
• 3 reference hooks: useToggle, useDebounce, useMediaQuery with anti-pattern comparisons

Files

File	Description
docs/hook-design-principles.md	Design document (requirements + C1-C14 + architecture + roadmap)
docs/react-hook-usage-patterns.md	React hook usage patterns (U1-U17 from react.dev)
packages/plugin/	Claude Code plugin structure

Validation

• claude plugin validate ✅ passed
• Project reference grep: 0 matches ✅
• SKILL.md token budget: review 598w, writing 552w (< 1500w limit) ✅

Install (after merge)

claude plugin install --source git-subdir \
  --url https://github.com/toss/react-simplikit.git \
  --path packages/plugin

Test plan

• Run /react-hook-review locally → verify checklist feedback
• Run /react-hook-writing locally → verify guide + patterns reference
• Discuss Q1-Q6 decisions and reflect changes
• Test git-subdir install from another React project

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