feat(rules): add rules/react/ track
Five rule files mirroring per-language convention (coding-style,
hooks, patterns, security, testing). Each has `paths:` glob
frontmatter for auto-activation when editing matching files.
- coding-style.md: file extensions, naming, JSX, RSC boundary
- hooks.md: React hooks (NOT Claude Code hooks) — rules-of-hooks,
dep arrays, cleanup, memoization, React 19 additions
- patterns.md: container/presentational split, state location
decision tree, Suspense + error boundaries, forms, data fetching
- security.md: dangerouslySetInnerHTML, unsafe URL schemes,
server-action validation, env-var leaks, CSP
- testing.md: RTL queries, userEvent, async, MSW, axe, anti-patterns
Each file extends typescript/* and common/* rules.
AlexisLeDain