Fix: Allow dorfs running Idle task to be job candidates

The bug: We excluded ALL Active state dorfs, but Idle tasks get
immediately promoted from Pending to Active by task_executor_system.
So by the time job_pathfinding runs, all dorfs are Active with Idle.

The fix: Check if dorf is 'busy' = Active AND non-Idle task.
Dorfs with Idle tasks (even in Active state) can be interrupted
for real jobs.

src/entities/tasks/job_pathfinding.rs

@@ -73,8 +73,7 @@ pub fn job_pathfinding_system(
         let mut total_dorfs = 0;
         let mut locked_count = 0;
         let mut not_standable_count = 0;
-        let mut not_idle_count = 0;
+        let mut busy_count = 0; // Truly busy: Active AND non-Idle
-        let mut active_count = 0;
 
         let candidate_dorfs: Vec<(Entity, IVec3)> = dorf_query
             .iter_mut()
@@ -92,23 +91,22 @@ pub fn job_pathfinding_system(
                     return None;
                 }
 
-                // Check if dorf is idle: queue is empty OR current task is Idle
+                // A dorf is available if:
+                // 1. Queue is empty, OR
+                // 2. Current task is Idle (we can replace it)
                 let current_task = queue.current();
                 let is_idle = queue.is_empty()
                     || current_task
                         .map(|t| matches!(t, Task::Idle { .. }))
                         .unwrap_or(false);
 
-                if !is_idle {
+                // A dorf is "busy" if they're Active AND doing non-Idle work
-                    not_idle_count += 1;
+                // We can interrupt Idle tasks but not other tasks
-                    return None;
-                }
-
-                // Allow Pending state (about to run) OR Completed/Failed states
-                // Only exclude Active dorfs (currently executing a task)
                 let state_val: &TaskState = &*state;
-                if matches!(state_val, TaskState::Active) {
+                let is_busy = matches!(state_val, TaskState::Active) && !is_idle;
-                    active_count += 1;
+
+                if is_busy {
+                    busy_count += 1;
                     return None;
                 }
 
@@ -117,8 +115,12 @@ pub fn job_pathfinding_system(
             .collect();
 
         info!(
-            "[PATHFIND] Dorfs: total={} locked={} not_standable={} not_idle={} active={} candidates={}",
+            "[PATHFIND] Dorfs: total={} locked={} not_standable={} busy={} candidates={}",
-            total_dorfs, locked_count, not_standable_count, not_idle_count, active_count, candidate_dorfs.len()
+            total_dorfs,
+            locked_count,
+            not_standable_count,
+            busy_count,
+            candidate_dorfs.len()
         );
 
         if candidate_dorfs.is_empty() {