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_radar_lock.nim

@@ -10,16 +10,16 @@ template check(cond: bool, msg: string) =
 
 # Bot at arena center; stationary enemy due north (same x, higher y).
 # Tank Royale: y increases northward.
-# True bearing to enemy = 0° (north = 0° in game coords).
+# Radar uses math convention (0°=east, CCW+); north = 90° in that system.
 
 let botX = 400.0
 let botY = 300.0
 let enemyX = 400.0   # same x → dx = 0
 let enemyY = 500.0   # north of bot → dy > 0
-let trueBearing = 0.0  # north
+let trueBearing = 90.0  # north in math convention (0=east, CCW+)
 
-# Radar starts pointing at the enemy (radarDirection = 0°, due north).
-var radarDir = 0.0
+# Radar starts pointing at the enemy (radarDirection = 90°, due north in math convention).
+var radarDir = 90.0
 
 var tracker = initEnemyTracker()
 # Prime with contact at the known position