chore: commit all changes and remove large IQ captures from tracking

Add .gitignore entry for data/subghz/captures/ to prevent large
IQ recording files from being committed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

utils/constants.py

@@ -256,6 +256,50 @@ MAX_DSC_MESSAGE_AGE_SECONDS = 3600  # 1 hour
 DSC_TERMINATE_TIMEOUT = 3
 
 
+# =============================================================================
+# SUBGHZ TRANSCEIVER (HackRF)
+# =============================================================================
+
+# Allowed ISM TX frequency bands (MHz) - transmit only within these ranges
+SUBGHZ_TX_ALLOWED_BANDS = [
+    (300.0, 348.0),    # 315 MHz ISM band
+    (387.0, 464.0),    # 433 MHz ISM band
+    (779.0, 928.0),    # 868/915 MHz ISM band
+]
+
+# HackRF frequency limits (MHz)
+SUBGHZ_FREQ_MIN_MHZ = 1.0
+SUBGHZ_FREQ_MAX_MHZ = 6000.0
+
+# HackRF gain ranges
+SUBGHZ_LNA_GAIN_MIN = 0
+SUBGHZ_LNA_GAIN_MAX = 40
+SUBGHZ_VGA_GAIN_MIN = 0
+SUBGHZ_VGA_GAIN_MAX = 62
+SUBGHZ_TX_VGA_GAIN_MIN = 0
+SUBGHZ_TX_VGA_GAIN_MAX = 47
+
+# Default sample rates available (Hz)
+SUBGHZ_SAMPLE_RATES = [2000000, 4000000, 8000000, 10000000, 20000000]
+
+# Maximum TX duration watchdog (seconds)
+SUBGHZ_TX_MAX_DURATION = 30
+
+# Sweep defaults
+SUBGHZ_SWEEP_BIN_WIDTH = 100000  # 100 kHz bins
+
+# SubGHz process termination timeout
+SUBGHZ_TERMINATE_TIMEOUT = 3
+
+# Common SubGHz preset frequencies (MHz)
+SUBGHZ_PRESETS = {
+    '315 MHz': 315.0,
+    '433.92 MHz': 433.92,
+    '868 MHz': 868.0,
+    '915 MHz': 915.0,
+}
+
+
 # =============================================================================
 # DEAUTH ATTACK DETECTION
 # =============================================================================