fix(SNNBot): apply weight update for every matured snapshot, not just last

Multiple snapshots can mature by EVALUATE time but only the last one
triggered a superSpikeUpdate. Earlier matured snapshots were silently
discarded — wasting learning signal. Now each matured snapshot with a
valid ring buffer hit gets its own weight update.

SNNBot_garage/src/SNNBot.nim

@@ -464,13 +464,9 @@ method run*(bot: SNNBot) =
       # Retroactive would-have-hit error signal: find the most recently matured snapshot.
       # A snapshot matures when currentTick >= snapshotTick + ceil(distance / BULLET_SPEED).
       # Look up enemy position at impact tick from ring buffer (offset from most-recent write).
-      var retroTarget = bot.lastRelBearing  # fallback (unused if no matured snapshot)
+      var retroTarget = bot.lastRelBearing  # fallback; overwritten by each matured snapshot (last one used for logging)
       var hasMatured = false
       var keepIdx = 0  # first non-matured snapshot to keep
-      # matureSnap holds the last matured snapshot's SNN state for the weight update.
-      var matureSpikes:   array[N_HID, float]
-      var matureVSnap:    array[N_HID, float]
-      var maturePreTrace: array[N_IN, float]
       for i in 0 ..< bot.snapshots.len:
         let snap = bot.snapshots[i]
         let travelTicks = int(ceil(snap.distance / BULLET_SPEED))
@@ -487,11 +483,10 @@ method run*(bot: SNNBot) =
             let ex = bot.posBuf[foundSlot].x
             let ey = bot.posBuf[foundSlot].y
             let absBearing = directionTo(snap.botX, snap.botY, ex, ey)
-            retroTarget    = normalizeRelativeAngle(absBearing - snap.gunHeading)
-            matureSpikes   = snap.spikes
-            matureVSnap    = snap.vSnap
-            maturePreTrace = snap.preTrace
-            hasMatured     = true
+            retroTarget = normalizeRelativeAngle(absBearing - snap.gunHeading)
+            # Update weights for every matured snapshot immediately; earlier ones were previously discarded.
+            bot.snn.superSpikeUpdate(snap.spikes, snap.vSnap, snap.preTrace, retroTarget)
+            hasMatured = true
           keepIdx = i + 1  # discard matured snapshots up to and including this one
         else:
           break  # snapshots are in order; stop at first non-matured
@@ -499,10 +494,6 @@ method run*(bot: SNNBot) =
       # or points past the last matured entry; the rest of bot.snapshots is kept intact).
       if keepIdx > 0:
         bot.snapshots = bot.snapshots[keepIdx .. ^1]
-      if hasMatured:
-        # Use SNN state captured at DECIDE time — not the stale bot.lastSpikes/lastVSnap
-        # which have been overwritten by subsequent DECIDE cycles.
-        bot.snn.superSpikeUpdate(matureSpikes, matureVSnap, maturePreTrace, retroTarget)
       # else: skip weight update — no matured snapshot yet (early game)
       # Compute verbose logging metrics
       var spikeCount = 0