Type keyword support

[cs01]

Summary

• type Foo = { ... } now fully supported as an equivalent to interface Foo { ... } for defining object shapes — including method signatures, which were previously silently dropped from type aliases in both parsers
• Docs updated to prefer type syntax in all examples (README, fetch, json, object, classes, features)

Changes

Parser fixes (src/parser-native/transformer.ts, src/parser-ts/transformer.ts):

• type Foo = { method(): void } — method signatures in type aliases now parsed and registered, matching interface behavior
• Both the TS and native parsers updated

Tests (tests/fixtures/interfaces/):

• type-alias-object.ts — nested type alias access
• type-alias-json-parse.ts — JSON.parse<T>() with a type alias
• type-alias-optional.ts — optional fields in type aliases

Test plan

• All 276 unit tests pass (npm test)
• type Foo = { ... } works interchangeably with interface Foo { ... } for field access, JSON.parse<T>(), optional fields, and method signatures