docs: fix ESP32 Docker command and add WSL2/dual-USB-C notes

- Fix incorrect --source esp32 CLI flag in Docker commands (pre-built
  image uses CSI_SOURCE env var: -e CSI_SOURCE=esp32)
- Add WSL2 mirrored networking instructions for receiving ESP32 UDP
  frames (networkingMode=mirrored in .wslconfig)
- Add dual USB-C port warning (UART port required for flash/serial)
- Fix serial port path: /dev/ttyUSB0 → /dev/ttyACM0 for WSL
- Add WSL2 entry in ESP32 troubleshooting section

Verified against ESP32-S3-WROOM-1 N16R8 on Windows 11 + WSL2.

Co-Authored-By: claude-flow <ruv@ruv.net>

docs/user-guide.md

@@ -304,7 +304,7 @@ Real Channel State Information at 20 Hz with 56-192 subcarriers. Required for po
 # From source
 ./target/release/sensing-server --source esp32 --udp-port 5005 --http-port 3000 --ws-port 3001
 
-# Docker (use CSI_SOURCE environment variable)
+# Docker (pre-built image uses CSI_SOURCE env var, not a CLI flag)
 docker run -p 3000:3000 -p 3001:3001 -p 5005:5005/udp -e CSI_SOURCE=esp32 ruvnet/wifi-densepose:latest
 ```
 
@@ -1014,6 +1014,8 @@ Pre-built binaries are available at [Releases](https://github.com/ruvnet/RuView/
 
 > **Important:** Always use **v0.4.3.1 or later**. Earlier versions have false fall detection alerts (v0.4.2 and below) and CSI disabled in the build config (pre-v0.4.1).
 
+> **Note:** If your board has two USB-C ports, use the **UART port** (not the OTG port) for flashing and serial monitoring. Using the wrong port results in `No serial data received`.
+
 ```bash
 # Flash an ESP32-S3 with 8MB flash (most boards)
 python -m esptool --chip esp32s3 --port COM7 --baud 460800 \
@@ -1105,11 +1107,13 @@ Binary size: 990 KB (8MB flash, 52% free) or 773 KB (4MB flash). v0.5.0 adds mmW
 
 **Start the aggregator:**
 
+> **WSL2 users:** WSL2's default NAT networking does not receive UDP packets sent to the Windows host IP. Enable mirrored networking so WSL shares the host network stack: add `networkingMode=mirrored` under `[wsl2]` in `%USERPROFILE%\.wslconfig`, then run `wsl --shutdown` and reopen WSL. Requires Windows 11 22H2+.
+
 ```bash
 # From source
 ./target/release/sensing-server --source esp32 --udp-port 5005 --http-port 3000 --ws-port 3001
 
-# Docker (use CSI_SOURCE environment variable)
+# Docker (pre-built image uses CSI_SOURCE env var, not a CLI flag)
 docker run -p 3000:3000 -p 3001:3001 -p 5005:5005/udp -e CSI_SOURCE=esp32 ruvnet/wifi-densepose:latest
 ```
 
@@ -1691,6 +1695,7 @@ Firmware versions prior to v0.4.1 had `CONFIG_ESP_WIFI_CSI_ENABLED` disabled in
 3. Check the target IP matches the sensing server machine: `python firmware/esp32-csi-node/provision.py --port COM7 --target-ip <YOUR_IP>`
 4. Verify UDP port 5005 is not blocked by firewall
 5. Test with: `nc -lu 5005` (Linux) or similar UDP listener
+6. **WSL2:** UDP to the Windows host IP does not reach WSL by default. Enable mirrored networking (see [ESP32-S3 Mesh](#esp32-s3-mesh) setup notes above).
 
 ### Build: Rust compilation errors
 

firmware/esp32-csi-node/README.md

@@ -37,6 +37,10 @@ MSYS_NO_PATHCONV=1 docker run --rm \
 
 ### 2. Flash
 
+Find your serial port (`COM7` on Windows, `/dev/ttyACM0` on Linux/WSL):
+
+> **Dual USB-C boards:** Use the **UART port**, not the OTG port. Using the wrong port results in `No serial data received` during flashing.
+
 ```bash
 python -m esptool --chip esp32s3 --port COM7 --baud 460800 \
   write_flash --flash_mode dio --flash_size 8MB \
@@ -47,6 +51,8 @@ python -m esptool --chip esp32s3 --port COM7 --baud 460800 \
 
 ### 3. Provision WiFi credentials (no reflash needed)
 
+> **WSL2 users:** WSL2's NAT networking does not receive UDP packets sent to the Windows host IP. Enable mirrored networking first: add `networkingMode=mirrored` under `[wsl2]` in `%USERPROFILE%\.wslconfig`, run `wsl --shutdown`, then reopen WSL. Requires Windows 11 22H2+.
+
 ```bash
 python scripts/provision.py --port COM7 \
   --ssid "YourSSID" --password "YourPass" --target-ip 192.168.1.20