Focus24 Kernel

The core already builds for every target; each host needs its adapter:

• Mobile: focus24-ffi over UniFFI for Swift and Kotlin, replacing the Swift StateScorer prototype.
• Embedded Linux: a headless daemon for Raspberry Pi or Jetson, V4L2 capture, derived state over IPC.
• Microcontroller: an embassy example on ESP32-S3, with landmarks arriving from a companion over UART or BLE.
• Desktop app: the Tauri shell in focus24/desktop calls the kernel directly.
• React edition: the JavaScript algorithms give way to the WebAssembly kernel, which is the point of the port.

Each one starts with the first test that needs it.