feat: Add One-Time Startup Remote Plugin Sync (#15264)

For early users who have already enabled apps, we should enable plugins
as part of the initial setup.

codex-rs/core/src/plugins/mod.rs

@@ -6,6 +6,7 @@ mod manifest;
 mod marketplace;
 mod remote;
 mod render;
+mod startup_sync;
 mod store;
 #[cfg(test)]
 pub(crate) mod test_support;