Hygiene B2: dead-code removal

Delete (unreferenced in any scene, per operator decision):
- TrainingDummy* chain (authoring/spawner/system/components/prefab) + UpgradePickup* chain (authoring/spawner/systems/components/prefab); remove TrainingDummyTag from the 3 live combat queries (AbilityFire/Melee/HealthApplyDamage now key on EnemyTag) and repoint HealthApplyDamageSystemTests to EnemyTag.
- Dead RPC RegionTransitSystem + RegionTransitRequest (no sender, ungated) + its test.
- Heartbeat + HeartbeatSystem (no WorldSystemFilter, ran no-op every tick) + its test.
- BuildSendSystem dead conveyor/pylon dev hooks (s_ConveyorDir, [/] rotation, Place{Pylon,Harvester,Conveyor} statics).
- Deprecated CyclePhase alias consts (Expedition/Defend/Build/*Ticks); repoint WaveSystemTests to Siege/Calm.
- Unread FeelConfig fields (HitFlashDurationMs, RumbleHeavy) + dangling HudUi doc-comments + stale crefs.

451/451 EditMode tests pass. CLAUDE.md HeartbeatSystemTests example ref to be repointed in B7.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Simulation/Combat/AbilityFireSystem.cs

@@ -80,7 +80,7 @@ namespace ProjectM.Simulation
             if (isServer)
             {
                 foreach (var (tx, th, te) in
-                         SystemAPI.Query<RefRO<LocalTransform>, RefRO<Health>>().WithAny<TrainingDummyTag, EnemyTag>().WithEntityAccess())
+                         SystemAPI.Query<RefRO<LocalTransform>, RefRO<Health>>().WithAll<EnemyTag>().WithEntityAccess())
                 {
                     if (th.ValueRO.Current <= 0f) continue; // B3: corpses are neither aim magnets nor cleave targets
                     candidatePositions.Add(tx.ValueRO.Position);