Add comprehensive tests and CI workflow for Python versions and manifests (signed)

[adilhusain-s]

Add comprehensive tests and CI workflow for Python versions and manifests

Summary

• Purpose: Strengthen test coverage and CI to ensure Python versions, manifest models, and package compatibility remain stable across upgrades.
• Scope: Adds extensive unit tests for manifest parsing and merging, Pydantic models, Typer and Requests API compatibility, and cross-module imports; introduces a GitHub Actions workflow to run tests on PRs.

Changes

• Tests:
  • tests/test_models_and_manifest_tools.py: Adds comprehensive tests validating:
    • FileEntry and ManifestEntry creation, validation, model_dump, JSON schema generation, copying, and error handling.
    • manifest_fetch, manifest_merge, and update_version behaviors including unique/overlapping versions and duplicate file handling.
    • Integration flow: fetch → merge → update, ensuring expected final manifest state.
    • Edge cases in parsing version lists, sorting stable vs prerelease, handling missing/empty/invalid entries.
  • tests/test_package_compatibility.py: Verifies compatibility with minimum package versions:
    • requests >= 2.32.5: urlopen response attributes and error handling via fetch_json, get_nuget_versions.
    • typer >= 0.19.2: app creation, options, echo, exit, and command registration.
    • pydantic >= 2.11.7: BaseModel instantiation, field validation, JSON schema, serialization, optional fields, strict validation, and nested models.
  • Additional tests for get_python_version.PythonManifestParser covering latest version retrieval with prerelease filters, unmatched filters, and complex sorting scenarios.
• CI:
  • Adds a GitHub Actions workflow to run the test suite on pushes/PRs, ensuring ongoing compatibility and preventing regressions.

Context

• Addresses gaps in automated verification for Python version handling and manifest tools that interact with multiple external dependencies and scripts.
• Ensures internal modules under .github/scripts and PowerShell remain importable and functionally compatible with pinned or minimum versions of third-party packages.

Commit History (branch-only)

• 25d0fd1: Add/update powershell-gen tar for v7.5.2
• fa7ad5a: Add GitHub Actions workflow for running tests
• 4be49c6: Add comprehensive tests for Python version handling, models, and package compatibility

Impact

• Increases confidence in manifest operations and version parsing across a wide range of edge cases.
• Reduces risk of breakage from dependency updates to Requests, Typer, and Pydantic.
• Provides immediate CI feedback for future changes.

Testing

• New tests pass locally; CI workflow will run pytest on PR creation to validate across environments.

Risks

• None identified; changes are additive (tests + workflow) and do not modify production code paths.

[adilhusain-s]

fix(ci): downgrade Python version from 3.14 to 3.13 in workflows                                                                 
                                                                                                                                 
Build failures were occurring due to pydantic-core (2.33.2) dependency failing to compile with Python 3.14. The underlying issue is that PyO3 v0.24.1 (Rust-Python interop library used by pydantic-core) only supports Python versions up to 3.13.                   
                                                                                                                                 
Changes:                                                                                                                         
- tests.yml: Changed python-version from '3.14' to '3.13'                                                                        
- release-latest-python-tag.yml: Changed python-version from '3.x' to '3.13'                                                     
- merge-manifest.yml: Changed python-version from '3.x' to '3.13'                                                                
                                                                                                                                 
Error encountered:                                                                                                               
  error: the configured Python interpreter version (3.14) is newer than PyO3's maximum supported version (3.13)                  
                                                                                                                                 
This change ensures all workflows use a compatible Python version until pydantic-core/PyO3 adds Python 3.14 support.