feat(wifiscan): add Rust macOS + Linux adapters, fix Python byte counters

- Add MacosCoreWlanScanner (macOS): CoreWLAN Swift helper adapter with
  synthetic BSSID generation via FNV-1a hash for redacted MACs (ADR-025)
- Add LinuxIwScanner (Linux): parses `iw dev <iface> scan` output with
  freq-to-channel conversion and BSS stanza parsing
- Both adapters produce Vec<BssidObservation> compatible with the
  existing WindowsWifiPipeline 8-stage processing
- Platform-gate modules with #[cfg(target_os)] so each adapter only
  compiles on its target OS
- Fix Python MacosWifiCollector: remove synthetic byte counters that
  produced misleading tx_bytes/rx_bytes data (set to 0)
- Add compiled Swift binary (mac_wifi) to .gitignore

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

v1/src/sensing/rssi_collector.py

@@ -696,15 +696,12 @@ class MacosWifiCollector:
             bufsize=1  # Line buffered
         )
 
-        synth_tx = 0
-        synth_rx = 0
-
         while self._running and self._process and self._process.poll() is None:
             try:
                 line = self._process.stdout.readline()
                 if not line:
                     continue
-                
+
                 line = line.strip()
                 if not line:
                     continue
@@ -714,22 +711,19 @@ class MacosWifiCollector:
                     if "error" in data:
                         logger.error("macOS WiFi utility error: %s", data["error"])
                         continue
-                        
+
                     rssi = float(data.get("rssi", -80.0))
                     noise = float(data.get("noise", -95.0))
-                    
+
                     link_quality = max(0.0, min(1.0, (rssi + 100.0) / 60.0))
-                    
-                    synth_tx += 1500
-                    synth_rx += 3000
-                    
+
                     sample = WifiSample(
                         timestamp=time.time(),
                         rssi_dbm=rssi,
                         noise_dbm=noise,
                         link_quality=link_quality,
-                        tx_bytes=synth_tx,
-                        rx_bytes=synth_rx,
+                        tx_bytes=0,
+                        rx_bytes=0,
                         retry_count=0,
                         interface=self._interface,
                     )