DR-042 Phase C (legibility, part 1): expedition objective HUD, Aether button, cold-start seed, Biomass sink, palette declutter

Scoping/design-gated (wf_7c5a555e-136). Fixes "the base reads as inert after Phase A":

- C7b objective readout: new replicated ExpeditionObjective{[GhostField] byte State, short Remaining} on the
  untagged CycleDirector ghost (cross-region safe). Sole writer ZoneEnemyDirectorSystem, written ABOVE its
  early-returns (snapshot-above-early-return) so the HUD never freezes stale. Play-verified it replicates
  server->client.
- C7a gate prompt + C7b HUD readout: HudSystem shows "GO TO THE EXPEDITION GATE" / "EXPEDITION IN PROGRESS - N
  remaining" / "CLEARED - return to claim", below the siege/overrun overrides.
- C6a Aether upgrade button: un-gated BuildSendSystem.UpgradeAbility (was #if UNITY_EDITOR); HudSystem adds a
  MenuUi.Button with live affordability tint (the only Aether sink was U-key only).
- C6c cold-start seed: CycleDirectorSpawnSystem seeds Tuning.StartingOre (50) into the ledger on a NEW game only
  (born-correct, pre-Playback), killing the silent turret-before-fabricator deadlock. Play-verified seededOre=50.
- C6b Biomass sink: Wall cost Ore->Biomass (the dead currency now has a home). Play-verified WallCostRes=Biomass.
- C6d palette declutter: hide dead Pylon/Harvester/Conveyor from the build palette + trimmed their dev hotkeys
  (catalog/prefabs stay baked, code-intact per DR-020).

389/389 EditMode + clean netcode Play smoke (ghost re-hash OK, no exceptions). SaveData stays v5.
C5 (walls block enemies) is the remaining Phase C item, sequenced separately.

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

Assets/_Project/Scripts/Client/Building/BuildSendSystem.cs

@@ -15,7 +15,7 @@ namespace ProjectM.Client
     /// rotates a conveyor's facing. Fire is suppressed while build mode is active (PlayerInputGatherSystem reads
     /// <see cref="BuildPaletteState.Active"/>), so the place-click never also fires. Build mode is suspended while
     /// the pause overlay is open, and the frame a palette button changes the selection never also places.
-    /// (2) keyboard hotkeys (fallback, suppressed in palette mode): B/V/N/H/F/C place at the local player's cell.
+    /// (2) keyboard hotkeys (fallback, suppressed in palette mode): B/V/F place at the local player's cell.
     /// Editor-only statics (PlaceStructure / PlaceHarvester / ...) drive the same RPC path from execute_code for
     /// headless validation. Managed SystemBase; UnityEngine.InputSystem types are fully qualified to avoid the
     /// ProjectM.Simulation.PlayerInput name collision. The server re-validates legality + cost authoritatively.
@@ -30,10 +30,9 @@ namespace ProjectM.Client
         {
             (UnityEngine.InputSystem.Key.B, StructureType.Turret),
             (UnityEngine.InputSystem.Key.V, StructureType.Wall),
-            (UnityEngine.InputSystem.Key.N, StructureType.Pylon),
-            (UnityEngine.InputSystem.Key.H, StructureType.Harvester),
             (UnityEngine.InputSystem.Key.F, StructureType.Fabricator),
-            (UnityEngine.InputSystem.Key.C, StructureType.Conveyor),
+            // DR-042 C6d: Pylon/Harvester/Conveyor are dead (unwired automation) — dropped from the hotkey fallback
+            // to match the hidden build palette; their PlaceStructure execute_code statics remain for dev.
         };
 
         UnityEngine.Camera _camera;   // cursor -> ground re-raycast for click-to-place (resolved lazily)
@@ -41,11 +40,16 @@ namespace ProjectM.Client
         Material _ghostMat;
         byte _lastSelected;           // skip placing on the frame a palette click changes the selection
 
+        // DR-042 C6a: the ability-upgrade send is RUNTIME (the HUD Aether button calls UpgradeAbility); only the
+        // execute_code PLACE statics stay editor-gated. Mirrors EquipSendSystem's unconditional queue + drain.
+        static int s_PendingUpgrades = 0;
+        /// <summary>Runtime hook (HUD Aether button) + execute_code: queue an ability-damage upgrade.</summary>
+        public static void UpgradeAbility() => s_PendingUpgrades++;
+
 #if UNITY_EDITOR
         struct PendingBuild { public byte Type; public int CellX; public int CellZ; public byte Direction; }
         static readonly System.Collections.Generic.Queue<PendingBuild> s_PendingBuild =
             new System.Collections.Generic.Queue<PendingBuild>();
-        static int s_PendingUpgrades = 0;
 
         /// <summary>EDITOR / execute_code hook: queue a structure placement at a specific cell.</summary>
         public static void PlaceStructure(byte type, int cellX, int cellZ, byte direction = 0) =>
@@ -69,8 +73,6 @@ namespace ProjectM.Client
         /// <summary>EDITOR / execute_code hook: queue a conveyor placement facing direction (0=+X,1=-X,2=+Z,3=-Z).</summary>
         public static void PlaceConveyor(int cellX, int cellZ, byte direction) => PlaceStructure(StructureType.Conveyor, cellX, cellZ, direction);
 
-        /// <summary>EDITOR / execute_code hook: queue an ability-damage upgrade.</summary>
-        public static void UpgradeAbility() => s_PendingUpgrades++;
 #endif
 
         protected override void OnCreate()
@@ -115,17 +117,19 @@ namespace ProjectM.Client
                     SendUpgrade(connection);
             }
 
+            // DR-042 C6a: the ability-upgrade drain runs at RUNTIME (the HUD Aether button enqueues via UpgradeAbility);
+            // only the execute_code PLACE drain stays editor-gated.
+            while (s_PendingUpgrades > 0)
+            {
+                s_PendingUpgrades--;
+                SendUpgrade(connection);
+            }
 #if UNITY_EDITOR
             while (s_PendingBuild.Count > 0)
             {
                 var b = s_PendingBuild.Dequeue();
                 SendBuild(connection, b.Type, b.CellX, b.CellZ, b.Direction);
             }
-            while (s_PendingUpgrades > 0)
-            {
-                s_PendingUpgrades--;
-                SendUpgrade(connection);
-            }
 #endif
         }