fix!: attach exported class decorators to their class

[exKAZUu]

Why

Decorators preceding export are siblings of the class, so class/decorator queries miss exported declarations. The JavaScript export rule causes the inherited problem reported in tree-sitter/tree-sitter-typescript#331.

Requirements

• required: Review fork and upstream issues, avoid duplicate PRs, and address worthwhile improvements in dedicated PRs; backward compatibility is not required.
• required: Run review-booster and complete-pr concurrently, then release verified changes.
• required: Exported class decorators must belong to the class declaration so consumers can find classes by their decorators, as requested in the upstream issue.
• chosen: Preserve canonical declaration and class query captures through a hidden supertype wrapper; directly aliasing the decorated class loses declaration-supertype captures.
• chosen: Keep the export_statement wrapper and include intervening export/default keywords within the decorated class range, because a class containing its leading decorators and body must span contiguous source text.
• chosen: Limit decorators before export to class declarations and reject decorators on both sides, matching the TC39 decorators proposal.

Customer Summary

Decorators before or after export now belong to class_declaration. Named exports and named/anonymous default classes retain canonical declaration queries and incremental parsing behavior.

Technical Summary

A hidden decorated-export supertype aliases to declaration and wraps the decorated class alias, preserving both levels of query ancestry. The class-only default-export branch uses the literal default keyword because its declaration form is unambiguous. Update the corpus expectation and regenerate the profiled parser and node types.

Testing

• MISE_RUST_VERSION=1.99.1 bun run verify: passed; no code-gauge violations in changed code.
• bun run build/ci: passed.
• bun wb test test/unit/exportedDecorators.test.ts test/unit/defaultExports.test.ts: 7 tests passed.
• script/tree-sitter test: all 199 corpus parses passed.
• bun wb test test/unit/queries.test.ts --grep 'compiles the queries': passed.
• Focused tests cover canonical queries, decorator ownership/ranges, default classes, comments, following-statement boundaries, incremental export edits, and invalid decorator placements. Full PR CI passed on the current head.

Notes

Breaking tree change: before-export decorators move from export_statement to class_declaration, whose range includes the intervening export/default keywords. Queries requiring those keywords to be direct children of export_statement must adapt.

TypeScript overrides its export and class rules; its corresponding integration is still needed before the upstream TypeScript issue is resolved in that fork. This PR does not address legacy call assignments or other grammar issues.