feat: Sensing-only UI mode with Gaussian splat visualization and Rust migration ADR

- Add Python WebSocket sensing server (ws_server.py) with ESP32 UDP CSI
  and Windows RSSI auto-detect collectors on port 8765
- Add Three.js Gaussian splat renderer with custom GLSL shaders for
  real-time WiFi signal field visualization (blue→green→red gradient)
- Add SensingTab component with RSSI sparkline, feature meters, and
  motion classification badge
- Add sensing.service.js WebSocket client with reconnect and simulation fallback
- Implement sensing-only mode: suppress all DensePose API calls when
  FastAPI backend (port 8000) is not running, clean console output
- ADR-019: Document sensing-only UI architecture and data flow
- ADR-020: Migrate AI/model inference to Rust with RuVector ONNX Runtime,
  replacing ~2.7GB Python stack with ~50MB static binary
- Add ruvnet/ruvector as upstream remote for RuVector crate ecosystem

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

v1/src/sensing/rssi_collector.py

@@ -444,3 +444,161 @@ class SimulatedCollector:
             retry_count=max(0, index // 100),
             interface="sim0",
         )
+
+
+# ---------------------------------------------------------------------------
+# Windows WiFi collector (real hardware via netsh)
+# ---------------------------------------------------------------------------
+
+class WindowsWifiCollector:
+    """
+    Collects real RSSI data from a Windows WiFi interface.
+
+    Data source: ``netsh wlan show interfaces`` which provides RSSI in dBm,
+    signal quality percentage, channel, band, and connection state.
+
+    Parameters
+    ----------
+    interface : str
+        WiFi interface name (default ``"Wi-Fi"``).  Must match the ``Name``
+        field shown by ``netsh wlan show interfaces``.
+    sample_rate_hz : float
+        Target sampling rate in Hz (default 2.0).  Windows ``netsh`` is slow
+        (~200-400ms per call) so rates above 2 Hz may not be achievable.
+    buffer_seconds : int
+        Ring buffer capacity in seconds (default 120).
+    """
+
+    def __init__(
+        self,
+        interface: str = "Wi-Fi",
+        sample_rate_hz: float = 2.0,
+        buffer_seconds: int = 120,
+    ) -> None:
+        self._interface = interface
+        self._rate = sample_rate_hz
+        self._buffer = RingBuffer(max_size=int(sample_rate_hz * buffer_seconds))
+        self._running = False
+        self._thread: Optional[threading.Thread] = None
+        self._cumulative_tx: int = 0
+        self._cumulative_rx: int = 0
+
+    # -- public API ----------------------------------------------------------
+
+    @property
+    def sample_rate_hz(self) -> float:
+        return self._rate
+
+    def start(self) -> None:
+        if self._running:
+            return
+        self._validate_interface()
+        self._running = True
+        self._thread = threading.Thread(
+            target=self._sample_loop, daemon=True, name="win-rssi-collector"
+        )
+        self._thread.start()
+        logger.info(
+            "WindowsWifiCollector started on '%s' at %.1f Hz",
+            self._interface,
+            self._rate,
+        )
+
+    def stop(self) -> None:
+        self._running = False
+        if self._thread is not None:
+            self._thread.join(timeout=2.0)
+            self._thread = None
+        logger.info("WindowsWifiCollector stopped")
+
+    def get_samples(self, n: Optional[int] = None) -> List[WifiSample]:
+        if n is not None:
+            return self._buffer.get_last_n(n)
+        return self._buffer.get_all()
+
+    def collect_once(self) -> WifiSample:
+        return self._read_sample()
+
+    # -- internals -----------------------------------------------------------
+
+    def _validate_interface(self) -> None:
+        try:
+            result = subprocess.run(
+                ["netsh", "wlan", "show", "interfaces"],
+                capture_output=True, text=True, timeout=5.0,
+            )
+            if self._interface not in result.stdout:
+                raise RuntimeError(
+                    f"WiFi interface '{self._interface}' not found. "
+                    f"Check 'netsh wlan show interfaces' for the correct name."
+                )
+            if "disconnected" in result.stdout.lower().split(self._interface.lower())[1][:200]:
+                raise RuntimeError(
+                    f"WiFi interface '{self._interface}' is disconnected. "
+                    f"Connect to a WiFi network first."
+                )
+        except FileNotFoundError:
+            raise RuntimeError(
+                "netsh not found. This collector requires Windows."
+            )
+
+    def _sample_loop(self) -> None:
+        interval = 1.0 / self._rate
+        while self._running:
+            t0 = time.monotonic()
+            try:
+                sample = self._read_sample()
+                self._buffer.append(sample)
+            except Exception:
+                logger.exception("Error reading WiFi sample")
+            elapsed = time.monotonic() - t0
+            sleep_time = max(0.0, interval - elapsed)
+            if sleep_time > 0:
+                time.sleep(sleep_time)
+
+    def _read_sample(self) -> WifiSample:
+        result = subprocess.run(
+            ["netsh", "wlan", "show", "interfaces"],
+            capture_output=True, text=True, timeout=5.0,
+        )
+        rssi = -80.0
+        signal_pct = 0.0
+
+        for line in result.stdout.splitlines():
+            stripped = line.strip()
+            # "Rssi" line contains the raw dBm value (available on Win10+)
+            if stripped.lower().startswith("rssi"):
+                try:
+                    rssi = float(stripped.split(":")[1].strip())
+                except (IndexError, ValueError):
+                    pass
+            # "Signal" line contains percentage (always available)
+            elif stripped.lower().startswith("signal"):
+                try:
+                    pct_str = stripped.split(":")[1].strip().rstrip("%")
+                    signal_pct = float(pct_str)
+                    # If RSSI line was missing, estimate from percentage
+                    # Signal% roughly maps: 100% ≈ -30 dBm, 0% ≈ -90 dBm
+                except (IndexError, ValueError):
+                    pass
+
+        # Normalise link quality from signal percentage
+        link_quality = signal_pct / 100.0
+
+        # Estimate noise floor (Windows doesn't expose it directly)
+        noise_dbm = -95.0
+
+        # Track cumulative bytes (not available from netsh; increment synthetic counter)
+        self._cumulative_tx += 1500
+        self._cumulative_rx += 3000
+
+        return WifiSample(
+            timestamp=time.time(),
+            rssi_dbm=rssi,
+            noise_dbm=noise_dbm,
+            link_quality=link_quality,
+            tx_bytes=self._cumulative_tx,
+            rx_bytes=self._cumulative_rx,
+            retry_count=0,
+            interface=self._interface,
+        )