feat: reqstool-regression-python — Python regression test wrapper

[jimisola]

Context

Depends on #324 (variant investigation) and #325 (SSOT requirements repo).

A thin Python wrapper repo that imports requirements from reqstool-regression via git location and adds Python-specific artifacts.

Proposed structure

A new repo reqstool/reqstool-regression-python containing:

• Imports reqstool-regression via git location
• 1–2 local requirements + SVCs to confirm local parsing works alongside imports
• Python source with @Requirements / @SVCs annotations (using reqstool-python-decorators)
• JUnit XML test results (surefire for unit tests, failsafe for integration tests)
• MVRs for manual-test verification cases
• annotations.yml mapping requirement/SVC IDs to Python FQNs

Key design decisions

• Identical imported requirement IDs as the Java counterpart (reqstool-regression-java) — enables cross-language regression comparison
• Uses hatch as build tool, python as language in reqstool_config.yml
• Test results include all outcomes: pass, fail, skip, missing

Interim fixture

Until this repo exists, a fixture at tests/fixtures/reqstool-regression-python/ in reqstool-client serves as a stand-in with the same structure (and can later become a git submodule).

Acceptance criteria

• New repo reqstool/reqstool-regression-python created
• Imports from reqstool-regression work correctly
• reqstool status and reqstool report produce valid output
• All enum coverage verified (significance, lifecycle, categories, verification types)
• CI runs reqstool status as a validation step