fix: resolve ruff lint errors and add lint CI job

Remove unused imports (deque, sys, Opcode, struct, _REPLAY_ADJUSTABLE_OPCODES)
across 4 active Python files and refactor semicolons to separate statements
in radar_protocol.py. Add ruff lint job to CI workflow targeting only the
active files (excludes legacy GUI_V*.py and v7/).

9_Firmware/9_3_GUI/radar_dashboard.py

@@ -21,7 +21,6 @@ Usage:
   python radar_dashboard.py --record     # Launch with HDF5 recording
 """
 
-import sys
 import os
 import time
 import queue
@@ -45,7 +44,7 @@ from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
 from radar_protocol import (
     RadarProtocol, FT2232HConnection, ReplayConnection,
     DataRecorder, RadarAcquisition,
-    RadarFrame, StatusResponse, Opcode,
+    RadarFrame, StatusResponse,
     NUM_RANGE_BINS, NUM_DOPPLER_BINS, WATERFALL_DEPTH,
 )
 

9_Firmware/9_3_GUI/radar_protocol.py

@@ -24,7 +24,7 @@ import logging
 from dataclasses import dataclass, field
 from typing import Optional, List, Tuple, Dict, Any
 from enum import IntEnum
-from collections import deque
+
 
 import numpy as np
 
@@ -764,13 +764,20 @@ class ReplayConnection:
                 dq = int(np.clip(dop_q[rbin, dbin], -32768, 32767))
                 d = 1 if det[rbin, dbin] else 0
 
-                buf[pos] = HEADER_BYTE; pos += 1
-                buf[pos:pos+2] = rq_bytes; pos += 2
-                buf[pos:pos+2] = ri_bytes; pos += 2
-                buf[pos:pos+2] = struct.pack(">h", di); pos += 2
-                buf[pos:pos+2] = struct.pack(">h", dq); pos += 2
-                buf[pos] = d; pos += 1
-                buf[pos] = FOOTER_BYTE; pos += 1
+                buf[pos] = HEADER_BYTE
+                pos += 1
+                buf[pos:pos+2] = rq_bytes
+                pos += 2
+                buf[pos:pos+2] = ri_bytes
+                pos += 2
+                buf[pos:pos+2] = struct.pack(">h", di)
+                pos += 2
+                buf[pos:pos+2] = struct.pack(">h", dq)
+                pos += 2
+                buf[pos] = d
+                pos += 1
+                buf[pos] = FOOTER_BYTE
+                pos += 1
 
         return bytes(buf)
 

9_Firmware/9_3_GUI/smoke_test.py

@@ -27,7 +27,6 @@ Exit codes:
 import sys
 import os
 import time
-import struct
 import argparse
 import logging
 

9_Firmware/9_3_GUI/test_radar_dashboard.py

@@ -21,7 +21,7 @@ from radar_protocol import (
     HEADER_BYTE, FOOTER_BYTE, STATUS_HEADER_BYTE,
     NUM_RANGE_BINS, NUM_DOPPLER_BINS, NUM_CELLS,
     DATA_PACKET_SIZE,
-    _HARDWARE_ONLY_OPCODES, _REPLAY_ADJUSTABLE_OPCODES,
+    _HARDWARE_ONLY_OPCODES,
 )