Add pythonPath/localModules config option for local Python modules

[bbopen]

Problem

When generating wrappers for local Python modules, users need to set PYTHONPATH manually:

PYTHONPATH=./python npx tywrap generate

The generator silently produces nothing if Python can't find the modules. There's no config option to specify where local modules live.

Current Behavior

// tywrap.config.ts
export default defineConfig({
  pythonModules: {
    'my_local_module': { functions: ['my_func'] }  // Won't find without PYTHONPATH
  }
});

Proposed Solution

Add a pythonPath or localModules option to the config:

export default defineConfig({
  pythonPath: ['./python', './src/python'],  // Added to PYTHONPATH during generation
  // or
  localModules: {
    path: './python',
    modules: ['my_local_module']
  },
  pythonModules: {
    'my_local_module': { functions: ['my_func'] }
  }
});

Additional Context

• Related to Add pythonPath/localModules config option for local Python modules #131 (silent failures) - better error messages would help here too
• Should document this behavior in getting-started guide

Labels

enhancement, config, developer-experience