fix(routines): add missing extension_manager field in trigger_manual EngineContext

The EngineContext construction in trigger_manual was missing the
extension_manager field, causing compilation failure on libsql-only
builds (Windows CI).

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

src/agent/routine_engine.rs

@@ -792,6 +792,7 @@ impl RoutineEngine {
             notify_tx: self.notify_tx.clone(),
             running_count: self.running_count.clone(),
             scheduler: self.scheduler.clone(),
+            extension_manager: self.extension_manager.clone(),
             tools: self.tools.clone(),
             safety: self.safety.clone(),
             sandbox_readiness: self.sandbox_readiness,