feat: prototype perimeter patrol, 3D view, and swarm algorithms

Add optional Three.js scene, base-pad lifecycle, mycelial swarms,
UFO transit steering, and algorithm selector (boids, APF, ACO, hypha).

prototype/README.md

@@ -2,6 +2,8 @@
 
 A 2D top-down view of the swarm data plane from [04 — Swarm sync](../docs/04-swarm-sync.md): drones patrol an area with static and mobile obstacles, exchange 5 Hz pose broadcasts (blue link flashes), and run opportunistic bulk sync of sealed partitions (green links with live rate and cumulative up/down counters).
 
+Optional **3d** checkbox in the header switches to a Three.js perimeter patrol scene (WebGPU/WebGL, shader terrain, transit escort, search panel). Off by default.
+
 No backend — a pure client-side simulation of the same behavioral model the Python simulator implements over real Parquet and UDP.
 
 ## Run
@@ -17,3 +19,4 @@ npm run dev     # http://localhost:5173
 - **Busy links turn green** and show current rate plus total transferred (`↑` / `↓`) — the bandwidth budget from the sync design made visible.
 - **Per-drone label**: id, current Wi-Fi channel (hopping), battery.
 - Controls: drone count, simulation speed, pause.
+- **3d** — perimeter patrol, altitude, detection beams, 4-drone escort sphere