feat(SNNBot): distance-adaptive aim smoothing

Far targets need more smoothing (small jitter = big miss at distance).
Close targets need less (fast tracking). Linear ramp α=0.3..0.9 over 0..600 units.

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

SNNBot_garage/src/SNNBot.nim

@@ -46,6 +46,9 @@ const
   # ponytail: uniform exploration noise; upgrade to annealed Gaussian if convergence needs tuning
   FIRE_POWER  = 1.0      # fixed firing power; bullet speed = 20 - 3*FIRE_POWER
   BULLET_SPEED = 20.0 - 3.0 * FIRE_POWER
+  AIM_SMOOTH_MIN = 0.3   # close range — responsive
+  AIM_SMOOTH_MAX = 0.9   # long range — heavy smoothing
+  SMOOTH_DIST_MAX = 600.0  # distance at which max smoothing kicks in
 
 # ── SNN types ─────────────────────────────────────────────────────────────────
 
@@ -345,11 +348,12 @@ method run*(bot: SNNBot) =
         let binInput  = toBinaryInput(relBearing, bot.velDirDeg, bot.velSpeed, bot.hasLastPos)
         let winBin    = bot.res.forward(binInput)
         let aimAngle  = bot.res.interpolatedAngle(winBin)
-        const AIM_SMOOTH = 0.6  # 60% old, 40% new — dampens flicker
-        # ponytail: AIM_SMOOTH=0.6 balances tracking vs stability; lower if gun lags, raise if gun dances
+        # Far → more smoothing (less jitter). Close → less smoothing (faster tracking).
+        # ponytail: linear ramp; tune MIN/MAX if gun lags close or jitters far
+        let alpha = clamp(bot.enemyDist / SMOOTH_DIST_MAX, AIM_SMOOTH_MIN, AIM_SMOOTH_MAX)
         let aimRad = degToRad(aimAngle)
-        bot.smoothSin = AIM_SMOOTH * bot.smoothSin + (1.0 - AIM_SMOOTH) * sin(aimRad)
-        bot.smoothCos = AIM_SMOOTH * bot.smoothCos + (1.0 - AIM_SMOOTH) * cos(aimRad)
+        bot.smoothSin = alpha * bot.smoothSin + (1.0 - alpha) * sin(aimRad)
+        bot.smoothCos = alpha * bot.smoothCos + (1.0 - alpha) * cos(aimRad)
         let smoothedAim = radToDeg(arctan2(bot.smoothSin, bot.smoothCos))
         bot.lastBinInput     = binInput
         bot.targetAngle      = gunDir + smoothedAim