fix: gsd-debug-session-manager uses stale Task() dispatcher (#3462)

* fix(debug): use Agent dispatcher in session manager

* chore(changeset): set pr field for #3462

.changeset/eager-lynx-munch.md

@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 3462
+---
+**`/gsd-debug` session manager now dispatches via `Agent()`** — stale `Task()` invocation no longer collapses debugger work into inline execution.

agents/gsd-debug-session-manager.md

@@ -83,7 +83,7 @@ goal: {goal}
 ```
 
 ```
-Task(
+Agent(
   prompt=filled_prompt,
   subagent_type="gsd-debugger",
   model="{debugger_model}",

tests/debug-session-management.test.cjs

@@ -161,10 +161,15 @@ describe('debug skill dispatch and sub-orchestrator (#2148, #2151)', () => {
 
   test('gsd-debug-session-manager agent exists with correct tools', () => {
     const content = fs.readFileSync(path.join(process.cwd(), 'agents', 'gsd-debug-session-manager.md'), 'utf8');
-    assert.ok(content.includes('Task'), 'gsd-debug-session-manager missing Task tool');
+    assert.ok(content.includes('Agent'), 'gsd-debug-session-manager missing Agent tool');
     assert.ok(content.includes('AskUserQuestion'), 'gsd-debug-session-manager missing AskUserQuestion tool');
   });
 
+  test('gsd-debug-session-manager spawns debugger with Agent() dispatcher', () => {
+    const content = fs.readFileSync(path.join(process.cwd(), 'agents', 'gsd-debug-session-manager.md'), 'utf8');
+    assert.ok(content.includes('\nAgent('), 'session manager must dispatch debugger with Agent(');
+  });
+
   test('gsd-debug-session-manager uses DATA_START/DATA_END for checkpoint responses', () => {
     const content = fs.readFileSync(path.join(process.cwd(), 'agents', 'gsd-debug-session-manager.md'), 'utf8');
     assert.ok(content.includes('DATA_START') && content.includes('DATA_END'),