feat(PPO_Bot): command abstraction layer — goto/aimTo controllers (#24)

- Add gotoTick/aimToTick controller functions (#25)
- Update network dims: actor 5→6, state 42→44 (#26)
- Rewrite mapActions for 6-dim command space (#27)
- Delete stale weight files (shape mismatch)
- Fix existing tests for new signatures

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

PPO_Bot/tests/test_state.nim

@@ -84,7 +84,7 @@ block testStateVectorLength:
     arenaWidth: 800.0, arenaHeight: 600.0,
   )
   let sv = buildStateVector(bot, t)
-  check sv.shape == [42], "state vector has 42 elements"
+  check sv.shape == [44], "state vector has 44 elements"
 
 block testStateVectorRange:
   var t = initEnemyTracker()
@@ -95,7 +95,7 @@ block testStateVectorRange:
     arenaWidth: 800.0, arenaHeight: 600.0,
   )
   let sv = buildStateVector(bot, t)
-  for i in 0 ..< 42:
+  for i in 0 ..< 44:
     check sv[i] >= -2.0f32 and sv[i] <= 2.0f32,
       &"sv[{i}]={sv[i]} out of [-2,2] range"
 
@@ -155,5 +155,8 @@ block testHistoryPaddedWhenEmpty:
   let sv = buildStateVector(bot, t)
   for i in 22 ..< 42:
     check sv[i] == 0.0f32, &"history slot {i} should be 0 when no contact"
+  # indices 42-43 (goto inputs) default to 0 when not provided
+  check sv[42] == 0.0f32, "sv[42] (remainingGotoDistance) should default to 0"
+  check sv[43] == 0.0f32, "sv[43] (remainingGunAngle) should default to 0"
 
 echo "All tests passed"