feat(schema): add generator blocks with env-toggleable TypeScript codegen

[quinnjr]

Summary

• New generator block in .prax schemas with generate = env("VAR") toggle support — generators can be enabled/disabled via environment variables (true/1/yes), literal booleans, or always-on (default)
• New prax-typegen crate (v0.1.0) — standalone TypeScript code generator that produces interfaces, enums, CreateInput/UpdateInput types, and Zod schemas with lazy relation refs; installable independently via cargo install prax-typegen
• prax-schema updates — Generator AST type, parser integration for generator_def blocks, Schema::enabled_generators() API

Schema Example

generator typescript {
  provider = "prax-typegen"
  output   = "./src/types"
  generate = env("TYPESCRIPT_GENERATE")
}

Test plan

• 23 tests in prax-schema for generator AST, toggle logic, parser integration
• 19 tests in prax-typegen for type mapping, interface generation, Zod generation
• cargo clippy clean (no new warnings)
• cargo fmt clean
• End-to-end: run prax-typegen against a sample .prax file and verify output

Made with Cursor

[github-actions]

📊 Benchmark Results

Benchmark jobs completed:

• Regression Check: failure
• Throughput Benchmarks: success
• Memory Benchmarks: success
• Async Benchmarks: success

See the Actions run for detailed benchmark results.