feat: ADR-024 Contrastive CSI Embedding Model — all 7 phases (#52)

Full implementation of Project AETHER — Contrastive CSI Embedding Model.

## Phases Delivered
1. ProjectionHead (64→128→128) + L2 normalization
2. CsiAugmenter (5 physically-motivated augmentations)
3. InfoNCE contrastive loss + SimCLR pretraining
4. FingerprintIndex (4 index types: env, activity, temporal, person)
5. RVF SEG_EMBED (0x0C) + CLI integration
6. Cross-modal alignment (PoseEncoder + InfoNCE)
7. Deep RuVector: MicroLoRA, EWC++, drift detection, hard-negative mining, SEG_LORA

## Stats
- 276 tests passing (191 lib + 51 bin + 16 rvf + 18 vitals)
- 3,342 additions across 8 files
- Zero unsafe/unwrap/panic/todo stubs
- ~55KB INT8 model for ESP32 edge deployment

Also fixes deprecated GitHub Actions (v3→v4) and adds feat/* branch CI triggers.

Closes #50

rust-port/wifi-densepose-rs/crates/wifi-densepose-hardware/Cargo.toml

@@ -4,7 +4,12 @@ version.workspace = true
 edition.workspace = true
 description = "Hardware interface abstractions for WiFi CSI sensors (ESP32, Intel 5300, Atheros)"
 license = "MIT OR Apache-2.0"
+authors = ["rUv <ruv@ruv.net>", "WiFi-DensePose Contributors"]
 repository = "https://github.com/ruvnet/wifi-densepose"
+documentation = "https://docs.rs/wifi-densepose-hardware"
+keywords = ["wifi", "esp32", "csi", "hardware", "sensor"]
+categories = ["hardware-support", "science"]
+readme = "README.md"
 
 [features]
 default = ["std"]

rust-port/wifi-densepose-rs/crates/wifi-densepose-hardware/README.md

@@ -0,0 +1,82 @@
+# wifi-densepose-hardware
+
+[![Crates.io](https://img.shields.io/crates/v/wifi-densepose-hardware.svg)](https://crates.io/crates/wifi-densepose-hardware)
+[![Documentation](https://docs.rs/wifi-densepose-hardware/badge.svg)](https://docs.rs/wifi-densepose-hardware)
+[![License](https://img.shields.io/crates/l/wifi-densepose-hardware.svg)](LICENSE)
+
+Hardware interface abstractions for WiFi CSI sensors (ESP32, Intel 5300, Atheros).
+
+## Overview
+
+`wifi-densepose-hardware` provides platform-agnostic parsers for WiFi CSI data from multiple
+hardware sources. All parsing operates on byte buffers with no C FFI or hardware dependencies at
+compile time, making the crate fully portable and deterministic -- the same bytes in always produce
+the same parsed output.
+
+## Features
+
+- **ESP32 binary parser** -- Parses ADR-018 binary CSI frames streamed over UDP from ESP32 and
+  ESP32-S3 devices.
+- **UDP aggregator** -- Receives and aggregates CSI frames from multiple ESP32 nodes (ADR-018
+  Layer 2). Provided as a standalone binary.
+- **Bridge** -- Converts hardware `CsiFrame` into the `CsiData` format expected by the detection
+  pipeline (ADR-018 Layer 3).
+- **No mock data** -- Parsers either parse real bytes or return explicit `ParseError` values.
+  There are no synthetic fallbacks.
+- **Pure byte-buffer parsing** -- No FFI to ESP-IDF or kernel modules. Safe to compile and test
+  on any platform.
+
+### Feature flags
+
+| Flag        | Default | Description                                |
+|-------------|---------|--------------------------------------------|
+| `std`       | yes     | Standard library support                   |
+| `esp32`     | no      | ESP32 serial CSI frame parsing             |
+| `intel5300` | no      | Intel 5300 CSI Tool log parsing            |
+| `linux-wifi`| no      | Linux WiFi interface for commodity sensing |
+
+## Quick Start
+
+```rust
+use wifi_densepose_hardware::{CsiFrame, Esp32CsiParser, ParseError};
+
+// Parse ESP32 CSI data from raw UDP bytes
+let raw_bytes: &[u8] = &[/* ADR-018 binary frame */];
+match Esp32CsiParser::parse_frame(raw_bytes) {
+    Ok((frame, consumed)) => {
+        println!("Parsed {} subcarriers ({} bytes)",
+                 frame.subcarrier_count(), consumed);
+        let (amplitudes, phases) = frame.to_amplitude_phase();
+        // Feed into detection pipeline...
+    }
+    Err(ParseError::InsufficientData { needed, got }) => {
+        eprintln!("Need {} bytes, got {}", needed, got);
+    }
+    Err(e) => eprintln!("Parse error: {}", e),
+}
+```
+
+## Architecture
+
+```text
+wifi-densepose-hardware/src/
+  lib.rs            -- Re-exports: CsiFrame, Esp32CsiParser, ParseError, CsiData
+  csi_frame.rs      -- CsiFrame, CsiMetadata, SubcarrierData, Bandwidth, AntennaConfig
+  esp32_parser.rs   -- Esp32CsiParser (ADR-018 binary protocol)
+  error.rs          -- ParseError
+  bridge.rs         -- CsiData bridge to detection pipeline
+  aggregator/       -- UDP multi-node frame aggregator (binary)
+```
+
+## Related Crates
+
+| Crate | Role |
+|-------|------|
+| [`wifi-densepose-core`](../wifi-densepose-core) | Foundation types (`CsiFrame` definitions) |
+| [`wifi-densepose-signal`](../wifi-densepose-signal) | Consumes parsed CSI data for processing |
+| [`wifi-densepose-mat`](../wifi-densepose-mat) | Uses hardware adapters for disaster detection |
+| [`wifi-densepose-vitals`](../wifi-densepose-vitals) | Vital sign extraction from parsed frames |
+
+## License
+
+MIT OR Apache-2.0