Add ISMS Listening Station with GSM cell detection

- Add spectrum monitoring via rtl_power with configurable presets
- Add OpenCelliD tower integration with Leaflet map display
- Add grgsm_scanner integration for passive GSM cell detection (alpha)
- Add rules engine for anomaly detection and findings
- Add baseline recording and comparison system
- Add setup.sh support for gr-gsm installation on Debian/Ubuntu

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

utils/isms/__init__.py

@@ -0,0 +1,79 @@
+"""
+ISMS (Intelligent Spectrum Monitoring Station) utilities.
+
+Provides spectrum analysis, tower integration, anomaly detection,
+and baseline management for RF situational awareness.
+"""
+
+from .spectrum import (
+    SpectrumBin,
+    BandMetrics,
+    run_rtl_power_scan,
+    compute_band_metrics,
+    detect_bursts,
+    get_rtl_power_path,
+)
+from .towers import (
+    CellTower,
+    query_nearby_towers,
+    build_cellmapper_url,
+    build_ofcom_coverage_url,
+    build_ofcom_emf_url,
+    get_opencellid_token,
+)
+from .rules import (
+    Rule,
+    Finding,
+    RulesEngine,
+    ISMS_RULES,
+)
+from .baseline import (
+    BaselineRecorder,
+    compare_spectrum_baseline,
+    compare_tower_baseline,
+)
+from .gsm import (
+    GsmCell,
+    GsmScanResult,
+    run_grgsm_scan,
+    run_gsm_scan_blocking,
+    get_grgsm_scanner_path,
+    format_gsm_cell,
+    deduplicate_cells,
+    identify_gsm_anomalies,
+)
+
+__all__ = [
+    # Spectrum
+    'SpectrumBin',
+    'BandMetrics',
+    'run_rtl_power_scan',
+    'compute_band_metrics',
+    'detect_bursts',
+    'get_rtl_power_path',
+    # Towers
+    'CellTower',
+    'query_nearby_towers',
+    'build_cellmapper_url',
+    'build_ofcom_coverage_url',
+    'build_ofcom_emf_url',
+    'get_opencellid_token',
+    # Rules
+    'Rule',
+    'Finding',
+    'RulesEngine',
+    'ISMS_RULES',
+    # Baseline
+    'BaselineRecorder',
+    'compare_spectrum_baseline',
+    'compare_tower_baseline',
+    # GSM
+    'GsmCell',
+    'GsmScanResult',
+    'run_grgsm_scan',
+    'run_gsm_scan_blocking',
+    'get_grgsm_scanner_path',
+    'format_gsm_cell',
+    'deduplicate_cells',
+    'identify_gsm_anomalies',
+]