Wire database Store into agent loop

Persist jobs and actions to PostgreSQL using fire-and-forget pattern:
- Scheduler passes store to Worker, persists cancellations
- Worker persists job status changes and tool execution actions
- Agent persists new jobs on creation
- All DB writes use tokio::spawn to avoid blocking execution

Store remains optional to preserve --no-db mode.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/agent/agent_loop.rs

@@ -47,6 +47,7 @@ impl Agent {
             llm.clone(),
             safety.clone(),
             tools.clone(),
+            store.clone(),
         ));
 
         Self {
@@ -171,6 +172,18 @@ impl Agent {
                 .await?;
         }
 
+        // Persist new job to database (fire-and-forget)
+        if let Some(ref store) = self.store {
+            if let Ok(ctx) = self.context_manager.get_context(job_id).await {
+                let store = store.clone();
+                tokio::spawn(async move {
+                    if let Err(e) = store.save_job(&ctx).await {
+                        tracing::warn!("Failed to persist new job {}: {}", job_id, e);
+                    }
+                });
+            }
+        }
+
         // Schedule for execution
         self.scheduler.schedule(job_id).await?;