type-ruby / t-ruby / 20878972305

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feat: add TypeScript-style array shorthand syntax `T[]` (#36)

* feat: add TypeScript-style array shorthand syntax `T[]`

- Add `String[]` as alternative to `Array<String>`
- Support nested arrays: `Integer[][]` → `Array[Array[Integer]]`
- Support nullable arrays: `String[]?` → `(Array[String] | nil)`
- Support arrays of nullable elements: `String?[]` → `Array[String?]`
- Support union type arrays: `(String | Integer)[]`
- Both syntaxes produce identical IR and RBS output
- Add parse_postfix_type_operators for `[]` and `?` suffix handling
- Add comprehensive unit tests (15 cases) and E2E tests (14 cases)
- Update README examples to show new syntax

* Update Gemfile.lock

* fix: restore Gemfile.lock with listen gem for CI compatibility

Ruby 4.0 skips listen gem installation, but CI runs on Ruby 3.x which
requires it. Restore the original Gemfile.lock from main branch.

* refactor: remove unused legacy type parsing code from IR::Builder

TypeParser now handles all type parsing including:
- Simple types, generics, array shorthand, union, intersection, function types

Remove legacy fallback code that was never executed, improving code coverage.

36 of 37 new or added lines in 3 files covered. (97.3%)

8206 of 8880 relevant lines covered (92.41%)

1806.32 hits per line