* feat(rules): add vue and nuxt rule sets
Add rules/vue/ and rules/nuxt/, each with the standard 5-file layout (coding-style, hooks, patterns, security, testing) that extends common/, following the Adding a New Language convention in rules/README.md.
Vue rules reference the frontend-patterns and vite-patterns skills. Nuxt rules reference the nuxt4-patterns and vite-patterns skills. Content is concise (1.5 to 4 KB per file) since rules load as always-on context.
* fix(rules): address PR review on vue and nuxt rule sets
- nuxt/coding-style: generalize the srcDir-override note (drop project-specific 'this repo' phrasing so it is correct for any Nuxt project).
- vue/hooks: add **/*.ts and **/*.tsx to paths so the lint/typecheck guidance loads when editing composables and stores.
- nuxt/hooks: add **/*.vue to paths (covers pages/layouts/components) and wrap nuxi typecheck in a timeout, mirroring web/hooks.md.
- nuxt/security: tighten the /security-review auto-trigger scope to external fetch, credential handling, and sensitive mutations, with examples.
- nuxt/testing: correct 'Vitest-only' to note built-in Playwright E2E, and drop the @nuxt/test-utils version pin.
- README: register vue and nuxt in the structure tree and install examples.
Skipped: 'X specific' -> 'X-specific' hyphenation (all existing rule sets use the unhyphenated form, changing only vue/nuxt would be inconsistent); repeating the 80%/TDD mandate in nuxt/testing (already inherited from common/testing.md).
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