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-api/Cargo.toml

@@ -3,5 +3,12 @@ name = "wifi-densepose-api"
 version.workspace = true
 edition.workspace = true
 description = "REST API for WiFi-DensePose"
+license.workspace = true
+authors = ["rUv <ruv@ruv.net>", "WiFi-DensePose Contributors"]
+repository.workspace = true
+documentation.workspace = true
+keywords = ["wifi", "api", "rest", "densepose", "websocket"]
+categories = ["web-programming::http-server", "science"]
+readme = "README.md"
 
 [dependencies]