style(core): tighten fragment section dividers

Co-authored-by: Codex <noreply@openai.com>

Author: charley-oai

codex-rs/core/src/context_manager/updates/developer_update_fragments.rs

@@ -23,10 +23,6 @@ use codex_protocol::models::developer_realtime_start_text;
 use codex_protocol::openai_models::ModelInfo;
 use codex_protocol::protocol::TurnContextItem;
 
-// ---------------------------------------------------------------------------
-// Settings-update fragments for the developer envelope
-// ---------------------------------------------------------------------------
-
 // ---------------------------------------------------------------------------
 // Model instructions fragment
 // ---------------------------------------------------------------------------

codex-rs/core/src/instructions/contextual_user_fragments.rs

@@ -114,6 +114,10 @@ impl ModelVisibleContextFragment for PluginInstructions {
     }
 }
 
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
 #[cfg(test)]
 mod tests {
     use super::*;