fix(SNNBot): fix reservoir threshold, remove decay, stop re-forward in EVALUATE

- Threshold 4→1: neurons now fire (~50% rate) instead of never firing
- Remove aggressive decay that erased learning signal immediately
- Remove EVALUATE re-forward that corrupted reservoir state before learn()

SNNBot_garage/src/SNNBot.nim

@@ -460,9 +460,12 @@ method run*(bot: SNNBot) =
         let absBearing = directionTo(myX, myY, futureX, futureY)
         let targetRel  = normalizeRelativeAngle(absBearing - bot.lastDecideGunDir)
         when USE_RESERVOIR:
-          let winBin   = bot.res.forward(toBitVec80(encodeInputFull(
-            normalizeRelativeAngle(bot.enemyBearing - bot.lastDecideGunDir),
-            bot.velDirDeg, bot.velSpeed, bot.hasLastPos)))
+          # state/scores already set by DECIDE's forward(); re-forwarding would corrupt them
+          let winBin   = block:
+            var best = 0; var bestS = -1
+            for k in 0 ..< N_BINS:
+              if bot.res.scores[k] > bestS: bestS = bot.res.scores[k]; best = k
+            best
           let aimAngle = bot.res.interpolatedAngle(winBin)
           bot.res.learn(targetRel)
           echo "RES tick=" & $bot.tick & " bin=" & $winBin &