Economy: base-local mining loop (mine at base, any attack harvests, scheduled sieges)

Consolidate the divorced combat + economy halves into one base-local loop. BaseFieldSpawnSystem tops up RegionTag{Base} Ore nodes around the plot; harvest routes Base->shared ledger and Expedition/untagged->personal inventory for BOTH the projectile (ResourceHarvestSystem) and melee (MeleeComboSystem server-only block, writes Remaining back for VFX). Activate the reserved Schedule source in ThreatDirectorSystem so base sieges arm WITHOUT an expedition trip (the loop-closer: previously zero waves ever attacked a base-only player). Region-filter the ExpeditionFieldSystem teardown so it no longer wipes the permanent base field. HudSystem shows phase-aware loop copy. See DR-031.

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

Assets/_Project/Scripts/Client/Presentation/HudSystem.cs

@@ -152,9 +152,12 @@ namespace ProjectM.Client
             var cam = Camera.main;
             bool onExpedition = cam != null && cam.transform.position.x > ExpeditionRegionXMin;
             _locationText.text = onExpedition
-                ? "ON EXPEDITION   -   return through the gate"
-                : "AT BASE   -   deploy through the gate when you're ready";
-            _locationText.style.color = onExpedition ? new Color(1f, 0.8f, 0.4f) : new Color(0.6f, 0.85f, 1f);
+                ? "ON EXPEDITION   -   carve the frontier, then return"
+                : siege
+                    ? "DEFEND THE BASE   -   hold the line"
+                    : "MINE THE CRYSTALS   -   any attack harvests Ore, then BUILD";
+            _locationText.style.color = onExpedition ? new Color(1f, 0.8f, 0.4f)
+                : siege ? new Color(1f, 0.55f, 0.4f) : new Color(0.6f, 0.95f, 0.7f);
 
             // ---- Goal (hex-pip meter, or a continuous bar for large targets) ----
             if (SystemAPI.TryGetSingleton<GoalProgress>(out var goal))