Merge Modelfamily into modelinfo (#8763)

- Merge ModelFamily into ModelInfo
- Remove logic for adding instructions to apply patch
- Add compaction limit and visible context window to `ModelInfo`

codex-rs/app-server-protocol/src/protocol/v2.rs

@@ -1247,6 +1247,7 @@ pub struct ThreadTokenUsageUpdatedNotification {
 pub struct ThreadTokenUsage {
     pub total: TokenUsageBreakdown,
     pub last: TokenUsageBreakdown,
+    // TODO(aibrahim): make this not optional
     #[ts(type = "number | null")]
     pub model_context_window: Option<i64>,
 }