feat: tighten preset filter, tame storage load logs, enable rollout prompt by default (#3628)

Summary
- common: use exact equality for Swiftfox exclusion to avoid hiding
future slugs that merely contain the substring
- core: treat missing internal_storage.json as expected (debug), warn
only on real IO/parse errors
- tui: drop DEBUG_HIGH gate; always consider showing rollout prompt, but
suppress under ApiKey auth mode

codex-rs/common/src/model_presets.rs

@@ -74,7 +74,7 @@ pub fn builtin_model_presets(auth_mode: Option<AuthMode>) -> Vec<ModelPreset> {
         Some(AuthMode::ApiKey) => PRESETS
             .iter()
             .copied()
-            .filter(|p| !p.model.contains(SWIFTFOX_MEDIUM_MODEL))
+            .filter(|p| p.model != SWIFTFOX_MEDIUM_MODEL)
             .collect(),
         _ => PRESETS.to_vec(),
     }