feat: Add wifi-densepose-mat disaster detection module

Implements WiFi-Mat (Mass Casualty Assessment Tool) for detecting and
localizing survivors trapped in rubble, earthquakes, and natural disasters.

Architecture:
- Domain-Driven Design with bounded contexts (Detection, Localization, Alerting)
- Modular Rust crate integrating with existing wifi-densepose-* crates
- Event-driven architecture for audit trails and distributed deployments

Features:
- Breathing pattern detection from CSI amplitude variations
- Heartbeat detection using micro-Doppler analysis
- Movement classification (gross, fine, tremor, periodic)
- START protocol-compatible triage classification
- 3D position estimation via triangulation and depth estimation
- Real-time alert generation with priority escalation

Documentation:
- ADR-001: Architecture Decision Record for wifi-Mat
- DDD domain model specification

rust-port/wifi-densepose-rs/crates/wifi-densepose-mat/src/detection/mod.rs

@@ -0,0 +1,17 @@
+//! Detection module for vital signs detection from CSI data.
+//!
+//! This module provides detectors for:
+//! - Breathing patterns
+//! - Heartbeat signatures
+//! - Movement classification
+//! - Ensemble classification combining all signals
+
+mod breathing;
+mod heartbeat;
+mod movement;
+mod pipeline;
+
+pub use breathing::{BreathingDetector, BreathingDetectorConfig};
+pub use heartbeat::{HeartbeatDetector, HeartbeatDetectorConfig};
+pub use movement::{MovementClassifier, MovementClassifierConfig};
+pub use pipeline::{DetectionPipeline, DetectionConfig, VitalSignsDetector};