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/radar_protocol.py

@@ -68,7 +68,7 @@ DATA_PACKET_SIZE = 11               # 1 + 4 + 2 + 2 + 1 + 1
 STATUS_PACKET_SIZE = 26              # 1 + 24 + 1
 
 NUM_RANGE_BINS = 512
-NUM_DOPPLER_BINS = 48                 # PR-F/PR-Q: 3 sub-frames * 16 (matches FPGA RP_NUM_DOPPLER_BINS)
+NUM_DOPPLER_BINS = 48                 # PR-F/PR-Q: 3 sub-frames * 16 (= FPGA RP_NUM_DOPPLER_BINS)
 NUM_CELLS = NUM_RANGE_BINS * NUM_DOPPLER_BINS  # 24576
 
 WATERFALL_DEPTH = 64