feat(adr-018): ESP32-S3 firmware, Rust aggregator, and live CSI pipeline

Complete end-to-end WiFi CSI capture pipeline verified on real hardware:

- ESP32-S3 firmware: WiFi STA + promiscuous mode CSI collection,
  ADR-018 binary serialization, UDP streaming at ~20 Hz
- Rust aggregator CLI binary (clap): receives UDP frames, parses with
  Esp32CsiParser, prints per-frame summary (node, seq, rssi, amp)
- UDP aggregator module with per-node sequence tracking and drop detection
- CsiFrame bridge to detection pipeline (amplitude/phase/SNR conversion)
- Python ESP32 binary parser with UDP reader
- Presence detection confirmed: motion score 10/10 from live CSI variance

Hardware verified: ESP32-S3-DevKitC-1 (CP2102, MAC 3C:0F:02:EC:C2:28),
Docker ESP-IDF v5.2 build, esptool 5.1.0 flash, 20 Rust + 6 Python tests pass.

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

firmware/esp32-csi-node/main/Kconfig.projbuild

@@ -0,0 +1,42 @@
+menu "CSI Node Configuration"
+
+    config CSI_NODE_ID
+        int "Node ID (0-255)"
+        default 1
+        range 0 255
+        help
+            Unique identifier for this ESP32 CSI node.
+
+    config CSI_TARGET_IP
+        string "Aggregator IP address"
+        default "192.168.1.100"
+        help
+            IP address of the UDP aggregator host.
+
+    config CSI_TARGET_PORT
+        int "Aggregator UDP port"
+        default 5005
+        range 1024 65535
+        help
+            UDP port the aggregator listens on.
+
+    config CSI_WIFI_SSID
+        string "WiFi SSID"
+        default "wifi-densepose"
+        help
+            SSID of the WiFi network to connect to.
+
+    config CSI_WIFI_PASSWORD
+        string "WiFi Password"
+        default ""
+        help
+            Password for the WiFi network. Leave empty for open networks.
+
+    config CSI_WIFI_CHANNEL
+        int "WiFi Channel (1-13)"
+        default 6
+        range 1 13
+        help
+            WiFi channel to listen on for CSI data.
+
+endmenu