feat(ModularBot): movement selector — phantom meteor + wave surfer

- Adds WaveSurferModule as second movement option
- Tracks damage per round via onHitByBullet, EMA decay α=0.5
- Every round after round 2: switches to lower-damage movement
- Body color signals active mover (orange=phantom, blue=wave)
- vs SpinBot 10r: ModularBot 1412 vs SpinBot 650
- vs WaveSurfer 10r: ModularBot 1858 vs WaveSurfer 10

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ModularBot_garage/src/ModularBot.nim

@@ -24,6 +24,7 @@ import guns/displacement
 import guns/averaged_lead
 import guns/decay_gf
 import movements/phantom_meteor
+import movements/wave_surfer
 
 const botJsonPath = currentSourcePath().parentDir / "ModularBot.json"
 const DebugVBullets = false
@@ -51,6 +52,12 @@ type
     avgLead:      AveragedLeadGun
     decayGF:      DecayGFGun
     mover:        PhantomMeteorModule
+    waveMover:    WaveSurferModule
+    movementId:   int    ## 0=phantom, 1=waveSurf
+    dmgPhantom:   float  ## rolling damage taken under phantom
+    dmgWaveSurf:  float  ## rolling damage taken under waveSurf
+    roundDmg:     float  ## damage this round
+    roundCount:   int
     virtualHits:  int
     virtualMiss:  int
     tick:         int
@@ -207,21 +214,46 @@ method onScannedBot*(bot: ModularBot, e: ScannedBotEvent) =
   setGunTurnRate(normDelta)
 
 
+method onHitByBullet*(bot: ModularBot, e: HitByBulletEvent) =
+  bot.roundDmg += e.damage
+
 method onRoundEnded*(bot: ModularBot, e: RoundEndedEventForBot) =
-  discard  # Skip detailed logging for now
+  # Accumulate damage into active movement bucket (exponential decay, α=0.5)
+  # ponytail: simple EMA; switch to longer window if thrashing becomes a problem
+  let decay = 0.5
+  if bot.movementId == 0:
+    bot.dmgPhantom  = decay * bot.dmgPhantom  + (1.0 - decay) * bot.roundDmg
+  else:
+    bot.dmgWaveSurf = decay * bot.dmgWaveSurf + (1.0 - decay) * bot.roundDmg
+  echo "[move] round dmg=", bot.roundDmg, " phantom_ema=", bot.dmgPhantom, " wave_ema=", bot.dmgWaveSurf
 
 method onRoundStarted*(bot: ModularBot, e: RoundStartedEvent) =
   setAdjustGunForBodyTurn(true)
   setAdjustRadarForBodyTurn(true)
   setAdjustRadarForGunTurn(true)
-  setBodyColor("#FF9900")   # PhantomMeteor: deep orange/gold
   setRadarColor("#00CCCC")  # RadarLock: cyan/teal
   setScanColor("#33FFFF")   # RadarLock scan arc: bright teal
   bot.radar.init()
   bot.hasContact = false
   bot.tick       = 0
-  bot.currentGun = -1  # Reset to trigger initial log on first selectShot
-  bot.mover.resetRound()
+  bot.currentGun = -1
+  bot.roundDmg   = 0.0
+  inc bot.roundCount
+
+  # Every 3 rounds: switch to lower-damage movement (probe every 3rd round)
+  # ponytail: simple 3-round probe; add hysteresis if switching thrashes
+  if bot.roundCount > 2:
+    bot.movementId = if bot.dmgPhantom <= bot.dmgWaveSurf: 0 else: 1
+
+  if bot.movementId == 0:
+    bot.mover.resetRound()
+    setBodyColor("#FF9900")   # PhantomMeteor: deep orange/gold
+    echo "[move] using phantom_meteor"
+  else:
+    bot.waveMover.resetRound()
+    setBodyColor("#0099FF")   # WaveSurfer: blue
+    echo "[move] using wave_surfer"
+
   echo fmt"[gun] starting: {GunNames[0]}"
   # tracker fitness persists across rounds (rolling window carries over)
 
@@ -239,8 +271,10 @@ method run*(bot: ModularBot) =
       go()
       continue
 
-    # Movement harness: oscillate perpendicular to enemy
-    let (spd, tr) = bot.mover.computeMove(bot.lastState)
+    # Movement harness: dispatch to active mover
+    let (spd, tr) =
+      if bot.movementId == 0: bot.mover.computeMove(bot.lastState)
+      else: bot.waveMover.computeMove(bot.lastState)
     setTargetSpeed(spd)
     setTurnRate(tr)
 
@@ -265,6 +299,7 @@ when isMainModule:
     decayGF:     initDecayGFGun(),
     radar:      RadarLockModule(),
     mover:      initPhantomMeteor(),
+    waveMover:  initWaveSurfer(),
     currentGun: -1,
   )
   start(bot, botJsonPath)