feat(test): add end-to-end validation for architecture_config integration

[rishi-jat]

Summary

Adds an integration test that validates the full pipeline for architecture_config within the ModelPack model specification.

This test ensures that a HuggingFace-style configuration can be converted into architecture_config, embedded into a Model, and passed through schema validation.

Scope

• Simulates HuggingFace config input
• Converts to architecture_config
• Embeds the result into a full Model object
• Validates using schema.ValidatorMediaTypeModelConfig

Test Coverage

• Valid end-to-end conversion and embedding
• Missing required HuggingFace fields
• Invalid model structure (schema rejection)
• Invalid field values (e.g., zero or incorrect types)

Notes

• Validation of architecture_config depends on the schema changes introduced in the corresponding schema PR.
• Until that schema is merged, validation is expected to fail specifically due to the presence of the architecture_config field.
• This test intentionally preserves the correct structure rather than bypassing validation.

Non-goals

• No changes to schema definitions
• No changes to conversion tooling
• No extension of architecture specification beyond minimal fields

This PR establishes a baseline integration check for future work on architecture specification, tooling, and validation.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a crucial end-to-end integration test to ensure the robust handling of architecture_config within the ModelPack model specification. It simulates the conversion of HuggingFace configurations into the architecture_config format, embeds this into a complete Model object, and then subjects it to schema validation. This establishes a foundational check for future work on architecture specification and tooling, without altering existing schema definitions or conversion logic.

Highlights

• New End-to-End Integration Test: Added a new end-to-end integration test specifically for the architecture_config within the ModelPack model specification.
• Full Pipeline Validation: Validated the complete pipeline, encompassing the conversion of HuggingFace-style configurations into architecture_config, embedding this configuration into a Model object, and subsequently performing schema validation.
• Comprehensive Test Coverage: Included test cases to cover valid conversions, scenarios with missing required HuggingFace fields, rejection of invalid model structures by the schema, and validation of field values (e.g., ensuring numerical values are within expected ranges).

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[gemini-code-assist]

Code Review

This pull request introduces schema/architecture_integration_test.go, which includes a utility function convertHFToArchConfig for converting HuggingFace configurations to an internal architecture format, along with several integration tests. These tests cover valid conversions, missing fields, invalid model structures, and invalid field values, and also validate the full pipeline including schema validation. Feedback suggests improving the archConfig map verification in TestArchitectureIntegrationValidConversion by using reflect.DeepEqual for robustness and conciseness. Additionally, it's recommended to explicitly handle the success case in the validation logic of TestArchitectureIntegrationValidConversion to enhance clarity for its dual-purpose nature.

[Copilot]

Pull request overview

Adds a new Go integration test to exercise the end-to-end pipeline for deriving an architecture_config-like object from a HuggingFace-style config and embedding it into a full Model JSON for schema validation (with current expected failure behavior until the schema accepts the new field).

Changes:

• Introduces schema/architecture_integration_test.go with a simulated HF→architecture_config conversion helper.
• Adds an end-to-end validation test that currently expects schema rejection due to architecture_config being an unknown field.
• Adds negative-path tests for missing HF fields, invalid model structure, and invalid numeric values.

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[rishi-jat]

/cc @aftersnow
/cc @bergwolf