Add Svelte language support with SvelteKit framework resolver

- Add 'svelte' to Language type, DEFAULT_CONFIG includes, grammars, and config validation
- Add SvelteExtractor that extracts <script> blocks and delegates to TS/JS TreeSitterExtractor
- Add Svelte framework resolver for runes ($state, $derived, $effect, etc.), store auto-subscriptions, SvelteKit module aliases ($app/*, $env/*, $lib/*), and SvelteKit route detection
- Update README to list Svelte and Dart in supported languages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/resolution/frameworks/index.ts

@@ -8,6 +8,7 @@ import { FrameworkResolver, ResolutionContext } from '../types';
 import { laravelResolver } from './laravel';
 import { expressResolver } from './express';
 import { reactResolver } from './react';
+import { svelteResolver } from './svelte';
 import { djangoResolver, flaskResolver, fastapiResolver } from './python';
 import { railsResolver } from './ruby';
 import { springResolver } from './java';
@@ -25,6 +26,7 @@ const FRAMEWORK_RESOLVERS: FrameworkResolver[] = [
   // JavaScript/TypeScript
   expressResolver,
   reactResolver,
+  svelteResolver,
   // Python
   djangoResolver,
   flaskResolver,
@@ -88,6 +90,7 @@ export function registerFrameworkResolver(resolver: FrameworkResolver): void {
 export { laravelResolver, FACADE_MAPPINGS } from './laravel';
 export { expressResolver } from './express';
 export { reactResolver } from './react';
+export { svelteResolver } from './svelte';
 export { djangoResolver, flaskResolver, fastapiResolver } from './python';
 export { railsResolver } from './ruby';
 export { springResolver } from './java';