fix: error handling

[jonaslagoni]

Note

Introduce centralized CodegenError system, apply it to config loading/validation and the generate command, and add comprehensive tests for error scenarios.

• Core error handling (src/codegen/errors.ts):
  • Add CodegenError class, ErrorType enum, helpers (createConfigNotFoundError, createConfigParseError, createInvalidPresetError, createConfigValidationError, etc.), parseZodErrors, and enhanceError.
• Configuration processing (src/codegen/configurations.ts):
  • Improve loadConfigFile to differentiate not-found vs. parse errors and throw typed errors with search locations.
  • Replace generic preset/validation errors with createInvalidPresetError and createConfigValidationError; log parsed Zod errors.
• CLI (src/commands/generate.ts):
  • Wrap execution and watch-mode paths with enhanceError; output formatted, user-friendly messages.
• Tests:
  • Add extensive unit tests for error helpers and parsing (test/codegen/errors.spec.ts).
  • Extend configuration tests for not-found/search behavior and validation logging (test/codegen/configurations.spec.ts).
  • Update generate command tests to cover error scenarios and cleanup; switch sample config to asyncapi.yaml.

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[jonaslagoni]

🎉 This PR is included in version 0.56.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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