chore(repo): cosim_dir replay revival + ruff lint cleanup

cosim_dir revival:
- gen_realdata_hex.py: also emit decimated_range_{i,q}.npy (48x512)
  and doppler_map_{i,q}.npy (512x48) at production dimensions; the
  same Python pipeline that produces the RTL .hex stimuli now writes
  the .npy intermediates v7.replay COSIM_DIR loads. Replaces the
  workflow lost when golden_reference.py was deleted in e8b495c
- test_v7.py: update test_get_frame_cosim shape from pre-PR-O.6
  (64,32) to (NUM_RANGE_BINS, NUM_DOPPLER_BINS)
- check in 4 .npy reference files (~400 KB, deterministic SCENE_SEED=42)

Ruff lint cleanup (was 66 errors; now 0):
- pyproject.toml: ignore T20 in tb/cosim/**.py (CLI tools)
- compare_independent.py: drop redundant int() casts (RUF046),
  swap try/except scipy import for importlib.util.find_spec,
  remove dead duplicate np import, ASCII-ize comment unicode,
  wrap E501 format strings
- fpga_reference.py: drop unused fs arg from nco_reference,
  collapse if/else to ternary, mark _out_im unused
- v7/processing.py: ASCII-ize x in docstring, collapse if-branches
- {dashboard,software_fpga,workers,radar_protocol}.py: wrap E501
- test_v7.py: ASCII-ize comment unicode, _alias renames where unused

Result: test_v7 100/100 (0 skips on radar_venv, was 9 graceful
skips); 5 cosim_dir orphan tests now active and passing.

9_Firmware/9_3_GUI/v7/dashboard.py

@@ -94,7 +94,7 @@ def _make_dspin() -> QDoubleSpinBox:
 # =============================================================================
 
 class RangeDopplerCanvas(FigureCanvasQTAgg):
-    """Matplotlib canvas showing the Range-Doppler map (NUM_RANGE_BINS x NUM_DOPPLER_BINS) with dark theme."""
+    """Matplotlib canvas showing the Range-Doppler map (NUM_RANGE_BINS x NUM_DOPPLER_BINS) with dark theme."""  # noqa: E501
 
     def __init__(self, _parent=None):
         fig = Figure(figsize=(10, 6), facecolor=DARK_BG)