feat(ModularBot): pluggable bot with 4 guns, phantom meteor movement, radar harness

- Gun harness: virtual bullet tracker, rolling fitness, auto-selector
- Guns: head-on, linear (extrapolation), circular (integrated formula), tsetlin machine (learning)
- Movement: phantom meteor gravity engine (danger histograms, phantom bullets, fire detection)
- Radar: harness + radar_lock adapter
- Color-coded modules: turret/bullet color per gun, body per movement, scan per radar
- Beats Target, SpinBot, Crazy, TrackFire in 10-round battles

common_libs/movement_harness/movement_interface.nim

@@ -0,0 +1,20 @@
+## Movement harness — shared types and MovementModule concept.
+## Mirrors gun_interface.nim structure.
+
+import gun_harness/gun_interface
+
+export gun_interface.WorldState
+
+type
+  MoveCommand* = tuple[speed: float, turnRate: float]
+    ## speed: target speed in px/tick, clamped to ±8 by bot API
+    ## turnRate: body turn rate in degrees/tick
+
+## MovementModule concept — any type T implementing computeMove is valid.
+template isMovementModule*(T: typedesc): bool =
+  compiles(
+    block:
+      var m: T
+      let ws = WorldState()
+      let cmd: MoveCommand = m.computeMove(ws)
+  )