fix: resolve all ruff lint errors across V6+ GUIs, v7 module, and FPGA cosim scripts
Fixes 25 remaining manual lint errors after auto-fix pass (94 auto-fixed earlier):
- GUI_V6.py: noqa on availability imports, bare except, unused vars, F811 redefs
- GUI_V6_Demo.py: unused app variable
- v7/models.py: noqa F401 on 8 try/except availability-check imports
- FPGA cosim: unused header/status/span vars, ambiguous 'l' renamed to 'line',
E701 while-on-one-line split, F841 padding vars annotated
Also adds v7/ module, GUI_PyQt_Map.py, and GUI_V7_PyQt.py to version control.
Expands CI lint job to cover all 21 maintained Python files (was 4).
All 58 Python tests pass. Zero ruff errors on all target files.
Jason
57de32b172