⚡ replace polling timers with sorted event queues + action log

Crops, tree seedlings, and tile recovery no longer iterate all entries
every frame. Each event stores an absolute gameTime timestamp (growsAt).
A sorted priority queue is drained each tick — only due items are touched.

WorldState now tracks gameTime (ms); stateManager.advanceTime(delta)
increments it each frame. Save version bumped 5→6 with migration.

Action log ring buffer (15 entries) added to LocalAdapter; shown in
the F3 debug panel under "Last Actions".

Closes #36
Closes #37

src/systems/DebugSystem.ts

@@ -2,6 +2,7 @@ import Phaser from 'phaser'
 import { TILE_SIZE } from '../config'
 import { TileType } from '../types'
 import { stateManager } from '../StateManager'
+import type { LocalAdapter } from '../NetworkAdapter'
 import type { VillagerSystem } from './VillagerSystem'
 import type { WorldSystem } from './WorldSystem'
 
@@ -18,6 +19,8 @@ export interface DebugData {
   nisseByState: { idle: number; walking: number; working: number; sleeping: number }
   jobsByType:   { chop: number; mine: number; farm: number }
   activePaths:  number
+  /** Recent actions dispatched through the adapter (newest last). */
+  actionLog: readonly string[]
 }
 
 /** Human-readable names for TileType enum values. */
@@ -39,6 +42,7 @@ export class DebugSystem {
   private scene:          Phaser.Scene
   private villagerSystem: VillagerSystem
   private worldSystem:    WorldSystem
+  private adapter:        LocalAdapter
   private pathGraphics!:  Phaser.GameObjects.Graphics
   private active = false
 
@@ -46,11 +50,13 @@ export class DebugSystem {
    * @param scene          - The Phaser scene this system belongs to
    * @param villagerSystem - Used to read active paths for visualization
    * @param worldSystem    - Used to read tile types under the mouse
+   * @param adapter        - Used to read the recent action log
    */
-  constructor(scene: Phaser.Scene, villagerSystem: VillagerSystem, worldSystem: WorldSystem) {
+  constructor(scene: Phaser.Scene, villagerSystem: VillagerSystem, worldSystem: WorldSystem, adapter: LocalAdapter) {
     this.scene          = scene
     this.villagerSystem = villagerSystem
     this.worldSystem    = worldSystem
+    this.adapter        = adapter
   }
 
   /**
@@ -159,6 +165,7 @@ export class DebugSystem {
       nisseByState,
       jobsByType,
       activePaths:    this.villagerSystem.getActivePaths().length,
+      actionLog:      this.adapter.getActionLog(),
     }
   }
 }

src/systems/FarmingSystem.ts

@@ -74,8 +74,8 @@ export class FarmingSystem {
       this.setTool(TOOL_CYCLE[(idx + 1) % TOOL_CYCLE.length])
     }
 
-    // Tick crop growth
-    const leveled = stateManager.tickCrops(delta)
+    // Drain crop growth queue (no delta — gameTime is advanced by GameScene)
+    const leveled = stateManager.tickCrops()
     for (const id of leveled) this.refreshCropSprite(id)
   }
 
@@ -151,11 +151,13 @@ export class FarmingSystem {
     }
 
     const cfg = CROP_CONFIGS[kind]
+    const now = stateManager.getGameTime()
     const crop: CropState = {
       id: `crop_${tileX}_${tileY}_${Date.now()}`,
       tileX, tileY, kind,
       stage: 0, maxStage: cfg.stages,
-      stageTimerMs: cfg.stageTimeMs,
+      growsAt:        now + cfg.stageTimeMs,
+      growsAtWatered: now + cfg.stageTimeMs / 2,
       watered: tile === TileType.WATERED_SOIL,
     }
     this.adapter.send({ type: 'PLANT_CROP', crop, seedItem })

src/systems/TreeSeedlingSystem.ts

@@ -38,7 +38,8 @@ export class TreeSeedlingSystem {
    * @param delta - Frame delta in milliseconds
    */
   update(delta: number): void {
-    const advanced = stateManager.tickSeedlings(delta)
+    // Drain seedling growth queue (no delta — gameTime is advanced by GameScene)
+    const advanced = stateManager.tickSeedlings()
     for (const id of advanced) {
       const state = stateManager.getState()
       const seedling = state.world.treeSeedlings[id]
@@ -91,7 +92,7 @@ export class TreeSeedlingSystem {
     const seedling: TreeSeedlingState = {
       id, tileX, tileY,
       stage: 0,
-      stageTimerMs: TREE_SEEDLING_STAGE_MS,
+      growsAt: stateManager.getGameTime() + TREE_SEEDLING_STAGE_MS,
       underlyingTile,
     }