agent_trace_db: Wire best-effort pull-on-setup when sync mode is active

AgentTraceDbLifecycle::setup now captures the AgentTraceDb::new() result
and performs an initial pull() when sync mode is active (both SCE_SYNC_URL
and SCE_SYNC_TOKEN set). The pull is best-effort — remote failure is logged
via tracing::warn! and setup continues without error.

Co-authored-by: SCE <sce@crocoder.dev>

Author: davidabram

cli/src/services/agent_trace_db/lifecycle.rs

@@ -51,8 +51,15 @@ impl ServiceLifecycle for AgentTraceDbLifecycle {
     }
 
     fn setup(&self, _ctx: &AppContext) -> Result<SetupOutcome> {
-        AgentTraceDb::new()
+        let db = AgentTraceDb::new()
             .context("Agent trace DB lifecycle setup failed while initializing agent trace DB")?;
+
+        if db.is_sync_mode() {
+            if let Err(e) = db.pull() {
+                tracing::warn!("Agent trace DB initial sync pull failed (setup continues): {e}");
+            }
+        }
+
         Ok(SetupOutcome::default())
     }
 }