Finish AckType transform support validation

[leoafarias]

This completes AckType transform support for generated wrappers by tracking transformed schema provenance, suppressing unsafe copyWith generation for transform-backed object and discriminated wrappers, and tightening cross-file transformed type resolution. It updates the analyzer, builder, model metadata, and AckType docs to match the supported behavior for direct, prefixed, and re-exported schema refs. The branch also expands generator integration coverage for transformed fields, nested transformed lists, discriminated branches, cross-file visibility failures, and re-exported refs. Finally, it adds a dedicated example transform schema plus tracked generated output, and validates that example build output in the example-folder integration test.

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[Copilot]

Pull request overview

Completes @AckType transform support in ack_generator by tracking transformed-schema provenance, updating wrapper generation rules (notably copyWith suppression), tightening cross-file transformed-type resolution, and expanding integration coverage (including a new example).

Changes:

• Add transformed-schema metadata (ModelInfo.isTransformedSchema, FieldInfo.isTransformedRepresentation) and use it to suppress unsafe copyWith() generation.
• Extend schema AST analysis to support built-in transformed helpers (Ack.uri/date/datetime/duration), explicit .transform<T>(), and stricter cross-file resolution/visibility rules.
• Add integration tests + an example transform schema with tracked generated output validated by the example-folder build test.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/ack_generator/test/test_utils/test_assets.dart	Updates test assets to model transformed schemas and new helpers used by integration tests.
packages/ack_generator/test/src/test_utilities.dart	Extends MockFieldInfo to include transformed-representation tracking.
packages/ack_generator/test/integration/example_folder_build_test.dart	Validates that the example folder generates transform wrappers correctly and avoids unsafe copyWith/reparsing.
packages/ack_generator/test/integration/ack_type_transform_test.dart	New end-to-end coverage for top-level and nested transformed schemas + failure cases.
packages/ack_generator/test/integration/ack_type_discriminated_test.dart	Ensures discriminated branches suppress copyWith when transformed fields are present.
packages/ack_generator/test/integration/ack_type_cross_file_resolution_test.dart	Expands cross-file resolution coverage for transformed refs, prefixes, re-exports, and visibility failures.
packages/ack_generator/lib/src/models/model_info.dart	Adds isTransformedSchema to model metadata.
packages/ack_generator/lib/src/models/field_info.dart	Adds isTransformedRepresentation to field metadata used by codegen.
packages/ack_generator/lib/src/generator.dart	Plumbs transformed-schema metadata through generator model cloning.
packages/ack_generator/lib/src/builders/type_builder.dart	Suppresses copyWith when transforms are involved; adjusts getter generation for transformed/special types.
packages/ack_generator/lib/src/analyzer/schema_ast_analyzer.dart	Implements transform-aware chain analysis, list element transform analysis, and stricter cross-file transformed type resolution.
packages/ack_annotations/lib/src/ack_type.dart	Updates @AckType docs to reflect supported transform behavior and constraints.
example/lib/schema_types_transforms.dart	Adds a concrete example demonstrating transform-backed @AckType schemas.
example/lib/schema_types_transforms.g.dart	Checks in generated output for the new example transform schema.