fix: full-repo ruff lint cleanup and CI migration to uv

Resolve all 374 ruff errors across 36 Python files (E501, E702, E722,
E741, F821, F841, invalid-syntax) bringing `ruff check .` to zero
errors repo-wide with line-length=100.

Rewrite CI workflow to use uv for dependency management, whole-repo
`ruff check .`, py_compile syntax gate, and merged python-tests job.
Add pyproject.toml with ruff config and uv dependency groups.

CI structure proposed by hcm444.

9_Firmware/9_2_FPGA/tb/cosim/compare.py

@@ -358,7 +358,10 @@ def compare_scenario(scenario_name):
 
     # ---- First/last sample comparison ----
     print("\nFirst 10 samples (after alignment):")
-    print(f"  {'idx':>4s}  {'RTL_I':>8s}  {'Py_I':>8s}  {'Err_I':>6s}  {'RTL_Q':>8s}  {'Py_Q':>8s}  {'Err_Q':>6s}")
+    print(
+        f"  {'idx':>4s}  {'RTL_I':>8s}  {'Py_I':>8s}  {'Err_I':>6s}  "
+        f"{'RTL_Q':>8s}  {'Py_Q':>8s}  {'Err_Q':>6s}"
+    )
     for k in range(min(10, aligned_len)):
         ei = aligned_rtl_i[k] - aligned_py_i[k]
         eq = aligned_rtl_q[k] - aligned_py_q[k]