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feat(chunker): add Dart language support (#69)

* feat(chunker): add Dart language support

Add full Dart language support via tree-sitter grammar from
go-sitter-forest/dart. Includes chunker registration with 11 query
patterns covering classes, mixins, enums, extensions, functions,
methods, typedefs, and constructors.

Closes ory/lumen#60

- Register .dart extension with tree-sitter query patterns
- Add findEnclosingSymbol support for Dart class_body/extension_body
  (scoped to Dart-specific parent types to avoid Python/Java/TS impact)
- Unit test with comprehensive Dart sample code
- Adversarial test covering async, generators, sealed/abstract classes,
  factory/named constructors, enhanced enums, comment exclusions
- E2E snapshot test with 18 fixture files from dart-lang/shelf
- bench-swe task using shelf_router HEAD content-length RFC bug
- Benchmark results: 76% cheaper, 79% faster, 84% fewer tokens with lumen

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: add Dart benchmark results to README and BENCHMARKS

Dart showed the strongest benchmark results across all 9 languages:
76% cost reduction, 79% time reduction, 82% fewer output tokens.
Update all summary tables, per-language rankings, and the supported
languages table in README.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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