⚡ 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/scenes/GameScene.ts

@@ -46,7 +46,7 @@ export class GameScene extends Phaser.Scene {
     this.villagerSystem.init(this.resourceSystem, this.farmingSystem)
     this.treeSeedlingSystem  = new TreeSeedlingSystem(this, this.adapter, this.worldSystem)
     this.foresterZoneSystem  = new ForesterZoneSystem(this, this.adapter)
-    this.debugSystem         = new DebugSystem(this, this.villagerSystem, this.worldSystem)
+    this.debugSystem         = new DebugSystem(this, this.villagerSystem, this.worldSystem, this.adapter)
 
     this.worldSystem.create()
     this.renderPersistentObjects()
@@ -145,6 +145,9 @@ export class GameScene extends Phaser.Scene {
   update(_time: number, delta: number): void {
     if (this.menuOpen) return
 
+    // Advance the in-game clock first so all tick methods see the updated time
+    stateManager.advanceTime(delta)
+
     this.cameraSystem.update(delta)
 
     this.resourceSystem.update(delta)
@@ -153,8 +156,8 @@ export class GameScene extends Phaser.Scene {
     this.villagerSystem.update(delta)
     this.debugSystem.update()
 
-    // Tick tile-recovery timers; refresh canvas for any tiles that reverted to GRASS
-    const recovered = stateManager.tickTileRecovery(delta)
+    // Drain tile-recovery queue; refresh canvas for any tiles that reverted to GRASS
+    const recovered = stateManager.tickTileRecovery()
     for (const key of recovered) {
       const [tx, ty] = key.split(',').map(Number)
       this.worldSystem.refreshTerrainTile(tx, ty, TileType.GRASS)

src/scenes/UIScene.ts

@@ -463,6 +463,9 @@ export class UIScene extends Phaser.Scene {
       '',
       `Paths: ${data.activePaths} (cyan lines in world)`,
       '',
+      '── Last Actions ───────────────',
+      ...(data.actionLog.length > 0 ? data.actionLog : ['—']),
+      '',
       '[F3] close',
     ])
   }