fix(FN-4606): honor configured worktreesDir in runtime and cleanup paths

Ref: Runfusion/Fusion#321
Fusion-Task-Id: FN-4606
Fusion-Task-Lineage: 94b23f37-944e-4bcd-bfa1-67d0a8c0a267

packages/dashboard/src/routes/register-task-workflow-routes.ts

@@ -391,7 +391,7 @@ export function registerTaskWorkflowRoutes(ctx: ApiRoutesContext, deps: TaskWork
           const settings = await scopedStore.getSettings();
           const rootDir = scopedStore.getRootDir();
           allocateWorktree = (reservedNames) =>
-            planTaskWorktreePath(existing, rootDir, settings.worktreeNaming, reservedNames);
+            planTaskWorktreePath(existing, rootDir, settings.worktreeNaming, reservedNames, settings);
         }
       }
 

packages/engine/src/executor.ts

@@ -2766,7 +2766,7 @@ export class TaskExecutor {
       }
 
       if (livenessFailure) {
-        const expected = `<repo>/.worktrees/* (usable, registered)`;
+        const expected = `${resolveWorktreesDir(this.rootDir, settings)}/* (usable, registered)`;
         const observed = `${worktreePath} (${observedWorktreeRealpath})`;
         const failureMessage = `worktree liveness assertion failed: ${livenessFailure} — observed=${observed}, expected=${expected}`;
         executorLog.error(`${task.id}: ${failureMessage}`);
@@ -4930,7 +4930,7 @@ export class TaskExecutor {
         ok: false,
         reason: "wrong_toplevel",
         observed: "missing task.worktree",
-        expected: "registered task worktree under <repo>/.worktrees/*",
+        expected: `registered task worktree under ${resolveWorktreesDir(this.rootDir, settings)}/*`,
       };
     }
 
@@ -4943,7 +4943,7 @@ export class TaskExecutor {
         ok: false,
         reason: "wrong_toplevel",
         observed: `unresolvable task.worktree (${worktreePath}): ${error instanceof Error ? error.message : String(error)}`,
-        expected: "resolvable task worktree under <repo>/.worktrees/*",
+        expected: `resolvable task worktree under ${resolveWorktreesDir(this.rootDir, settings)}/*`,
       };
     }
 

packages/engine/src/runtimes/in-process-runtime.ts

@@ -212,8 +212,9 @@ export class InProcessRuntime
       // ensures scanIdleWorktrees / rehydrate never sees broken entries, and
       // prevents assertValidWorktreeSession from permanently blocking retries.
       const { reapOrphanWorktrees, scanIdleWorktrees } = await import("../worktree-pool.js");
+      const settings = await this.taskStore.getSettings();
       try {
-        const reaped = await reapOrphanWorktrees(this.config.workingDirectory);
+        const reaped = await reapOrphanWorktrees(this.config.workingDirectory, settings);
         if (reaped > 0) {
           runtimeLog.log(`Reaped ${reaped} half-initialized orphan worktree(s) on startup`);
         }
@@ -236,7 +237,8 @@ export class InProcessRuntime
       // Rehydrate pool from disk state (idle worktrees)
       const idleWorktrees = await scanIdleWorktrees(
         this.config.workingDirectory,
-        this.taskStore
+        this.taskStore,
+        settings,
       );
       if (idleWorktrees.length > 0) {
         this.worktreePool.rehydrate(idleWorktrees);

packages/engine/src/self-healing.ts

@@ -4364,7 +4364,7 @@ export class SelfHealingManager {
         return await this.reapUnregisteredOrphans();
       }
 
-      const orphaned = await scanIdleWorktrees(this.options.rootDir, this.store);
+      const orphaned = await scanIdleWorktrees(this.options.rootDir, this.store, settings);
       if (orphaned.length === 0) return 0;
 
       let cleaned = 0;
@@ -4666,7 +4666,7 @@ export class SelfHealingManager {
       if (dirs.length <= cap) return;
 
       // Find idle worktrees that can be safely removed
-      const idle = await scanIdleWorktrees(this.options.rootDir, this.store);
+      const idle = await scanIdleWorktrees(this.options.rootDir, this.store, settings);
       if (idle.length === 0) return;
 
       // Sort by mtime ascending (oldest first)