Make class/enum query-capturable; Helix-compatible SPM queries

[iliaskarim]

Summary

• Unwrap `token(reservedWord('class'|'enum'))` so tree-sitter queries can capture anonymous `"class"` / `"enum"` as keywords, and regenerate the parser.
• Fix `Package.swift` to always include `src/scanner.c` (manifest-time path probe can drop it) and declare iOS/macOS platforms.
• Replace `queries/highlights.scm` with Helix-compatible captures (`class`/`enum` as `@keyword`, plus a `command_name` fallback).

Why

Swift/Helix consumers cannot highlight `class`/`enum` as keywords while those words are wrapped in `token()`. Apps end up sed-patching `grammar.js` and post-processing Helix queries. Baking the grammar + query fixes into the SPM `queries/` bundle removes that.

Based on current `main` (`e7bd348`).

Test plan

• `class Foo {}` / `enum Bar {}` parse as `class_statement` / `enum_statement`
• `"class" @keyword` / `"enum" @keyword` match in highlights
• SPM package builds with scanner symbols on iOS

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