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/Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "crates/wifi-densepose-hardware",
     "crates/wifi-densepose-wasm",
     "crates/wifi-densepose-cli",
+    "crates/wifi-densepose-mat",
 ]
 
 [workspace.package]
@@ -91,6 +92,7 @@ wifi-densepose-db = { path = "crates/wifi-densepose-db" }
 wifi-densepose-config = { path = "crates/wifi-densepose-config" }
 wifi-densepose-hardware = { path = "crates/wifi-densepose-hardware" }
 wifi-densepose-wasm = { path = "crates/wifi-densepose-wasm" }
+wifi-densepose-mat = { path = "crates/wifi-densepose-mat" }
 
 [profile.release]
 lto = true