Stop persisting bridged log events (#29599)

## Why

The 0.142.0 persistent-log filter disables target=log, but bridged log
records are filtered using their original dependency target before
tracing-log emits them as target=log. This allowed high-volume
dependency TRACE events to keep reaching SQLite.

This is a follow-up to #28224.

## What changed

- Reject bridged target=log events inside the SQLite sink before
formatting or queueing them.

codex-rs/state/src/log_db.rs

@@ -199,6 +199,13 @@ where
 
     fn on_event(&self, event: &Event<'_>, ctx: tracing_subscriber::layer::Context<'_, S>) {
         let metadata = event.metadata();
+        // `tracing-log` checks filters with the original log target before
+        // dispatching an event whose tracing target is `log`, so the outer
+        // target filter cannot reliably reject these bridged events.
+        if metadata.target() == "log" {
+            return;
+        }
+
         // The SDK emits DEBUG timer meta-events every second per process; these
         // were over 30% of retained logs in measured high-fanout Codex environments.
         if metadata.target() == "opentelemetry_sdk"