END-1: the base can be lost - a losable Engine Core with integrity

Adds CoreIntegrity{[GhostField] Current,Max,OverrunTick} on the GLOBAL
CycleDirector ghost (no new ghost/relevancy). CoreDamageSystem (server,
after EnemyAISystem): a Husk within ~3u of PlotCenter drains + is consumed;
CoreRestoreSystem regenerates only in Calm. The SOFT-loss edge lives inside
CyclePhaseSystem (sole Phase writer): Current<=0 in Siege flips to Calm with
NO goal reward, StorageMath.DrainFraction drains the shared ledger, all Husks
despawn, and OverrunTick is stamped (a transient HUD-flash pulse, not a
latching outcome - the Victory latch is END-2's). EnemyAISystem treats the
Core as a FALLBACK target so an undefended base is overrun instead of idling.
SaveData -> v4 persists CoreCurrent (0 -> born full, the EB-1 HP sentinel);
3 live TuningConfig knobs + a red HUD Core bar. Soft-loss + targeting +
breach-resolution forks operator-locked.

See DR-034.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/_Project/Scripts/Client/Debug/DebugOverlay.cs

@@ -106,6 +106,10 @@ namespace ProjectM.Client
                 TuningRow("Melee combo len", TuningKnob.MeleeComboLength, 1f, "0");
                 GUILayout.Space(4);
                 TuningRow("Struct aggro w", TuningKnob.StructureAggroWeight, 0.1f, "0.00"); // EB-1: <1 prefers structures
+                TuningRow("Core dmg/husk", TuningKnob.CoreDamagePerHusk, 1f, "0");        // END-1: integrity per breaching Husk
+                TuningRow("Core regen int", TuningKnob.CoreRegenIntervalTicks, 1f, "0");   // END-1: ticks between +1 in Calm
+                TuningRow("Core overrun %", TuningKnob.CoreOverrunDrainPct, 0.05f, "0.00"); // END-1: ledger fraction lost on breach
+
             }
 
             GUILayout.EndScrollView();