Add bias_t parameter to build_ism_command()

Same fix as build_fm_demod_command() - the parameter was being
passed but not defined in the method signatures.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

utils/sdr/hackrf.py

@@ -123,7 +123,8 @@ class HackRFCommandBuilder(CommandBuilder):
         device: SDRDevice,
         frequency_mhz: float = 433.92,
         gain: Optional[float] = None,
-        ppm: Optional[int] = None
+        ppm: Optional[int] = None,
+        bias_t: bool = False
     ) -> list[str]:
         """
         Build rtl_433 command with SoapySDR support for ISM band decoding.
@@ -142,6 +143,9 @@ class HackRFCommandBuilder(CommandBuilder):
         if gain is not None and gain > 0:
             cmd.extend(['-g', str(int(gain))])
 
+        if bias_t:
+            cmd.extend(['-T'])
+
         return cmd
 
     def get_capabilities(self) -> SDRCapabilities: