chore(repo): rename rust-port/wifi-densepose-rs → v2/ (flatten to one level) (#427)

The Rust port lived two directories deep (rust-port/wifi-densepose-rs/)
without any sibling under rust-port/ that warranted the extra level.
Move the whole workspace up to v2/ to match v1/ (Python) at the same
depth and shorten every cd / build command across the repo.

git mv preserves history for all tracked files. 60 files updated for
path references (CI workflows, ADRs, docs, scripts, READMEs, internal
.claude-flow state). Two manual fixes for relative-cd paths in
CLAUDE.md and ADR-043 that became wrong after the depth change
(cd ../.. → cd ..).

Validated:
- cargo check --workspace --no-default-features → clean (after target/
  nuke; the gitignored target/ was carried by the OS rename and had
  hard-coded old paths in build scripts)
- cargo test --workspace --no-default-features → 1,539 passed, 0 failed,
  8 ignored (same totals as pre-rename)
- ESP32-S3 on COM7 → still streaming live CSI (cb #40300, RSSI -64 dBm)

After-merge follow-up: contributors should `rm -rf v2/target` once and
let cargo regenerate from the new path.

v2/docs/ddd/domain-model.md

@@ -0,0 +1,114 @@
+# Domain-Driven Design: WiFi-DensePose Domain Model
+
+## Bounded Contexts
+
+### 1. Signal Domain
+**Purpose**: Raw CSI data acquisition and preprocessing
+
+**Aggregates**:
+- `CsiFrame`: Raw CSI measurement from WiFi hardware
+- `ProcessedSignal`: Cleaned and feature-extracted signal
+
+**Value Objects**:
+- `Amplitude`: Signal strength measurements
+- `Phase`: Phase angle measurements
+- `SubcarrierData`: Per-subcarrier information
+- `Timestamp`: Measurement timing
+
+**Domain Services**:
+- `CsiProcessor`: Preprocesses raw CSI data
+- `PhaseSanitizer`: Unwraps and cleans phase data
+- `FeatureExtractor`: Extracts signal features
+
+### 2. Pose Domain
+**Purpose**: Human pose estimation from processed signals
+
+**Aggregates**:
+- `PoseEstimate`: Complete DensePose output
+- `InferenceSession`: Neural network session state
+
+**Value Objects**:
+- `BodyPart`: Labeled body segment (torso, arms, legs, etc.)
+- `UVCoordinate`: Surface mapping coordinate
+- `Keypoint`: Body joint position
+- `Confidence`: Prediction confidence score
+
+**Domain Services**:
+- `ModalityTranslator`: CSI → visual feature translation
+- `DensePoseHead`: Body part segmentation and UV regression
+
+### 3. Streaming Domain
+**Purpose**: Real-time data delivery to clients
+
+**Aggregates**:
+- `Session`: Client connection with history
+- `StreamConfig`: Client streaming preferences
+
+**Value Objects**:
+- `WebSocketMessage`: Typed message payload
+- `ConnectionState`: Active/idle/disconnected
+
+**Domain Services**:
+- `StreamManager`: Manages client connections
+- `BroadcastService`: Pushes updates to subscribers
+
+### 4. Storage Domain
+**Purpose**: Persistence and retrieval
+
+**Aggregates**:
+- `Recording`: Captured CSI session
+- `ModelArtifact`: Neural network weights
+
+**Repositories**:
+- `SessionRepository`: Session CRUD operations
+- `RecordingRepository`: Recording storage
+- `ModelRepository`: Model management
+
+### 5. Hardware Domain
+**Purpose**: Physical device management
+
+**Aggregates**:
+- `Device`: WiFi router/receiver
+- `Antenna`: Individual antenna configuration
+
+**Domain Services**:
+- `DeviceManager`: Device discovery and control
+- `CsiExtractor`: Raw CSI extraction
+
+## Context Map
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                      WiFi-DensePose                         │
+├─────────────────────────────────────────────────────────────┤
+│                                                             │
+│  ┌──────────────┐     ┌──────────────┐     ┌─────────────┐ │
+│  │   Hardware   │────▶│    Signal    │────▶│    Pose     │ │
+│  │   Domain     │     │    Domain    │     │   Domain    │ │
+│  └──────────────┘     └──────────────┘     └─────────────┘ │
+│         │                    │                    │        │
+│         │                    │                    │        │
+│         ▼                    ▼                    ▼        │
+│  ┌──────────────────────────────────────────────────────┐  │
+│  │                   Storage Domain                      │  │
+│  └──────────────────────────────────────────────────────┘  │
+│         │                    │                    │        │
+│         ▼                    ▼                    ▼        │
+│  ┌──────────────────────────────────────────────────────┐  │
+│  │                  Streaming Domain                     │  │
+│  └──────────────────────────────────────────────────────┘  │
+│                                                             │
+└─────────────────────────────────────────────────────────────┘
+```
+
+## Ubiquitous Language
+
+| Term | Definition |
+|------|------------|
+| CSI | Channel State Information - WiFi signal properties |
+| Subcarrier | Individual frequency component in OFDM |
+| Phase Unwrapping | Correcting 2π phase discontinuities |
+| DensePose | Dense human pose estimation with UV mapping |
+| Modality Translation | Converting CSI features to visual features |
+| Body Part | One of 15 labeled human body segments |
+| UV Mapping | 2D surface parameterization of 3D body |