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/codex-api/tests/models_integration.rs

@@ -56,7 +56,7 @@ async fn models_client_hits_models_endpoint() {
             slug: "gpt-test".to_string(),
             display_name: "gpt-test".to_string(),
             description: Some("desc".to_string()),
-            default_reasoning_level: ReasoningEffort::Medium,
+            default_reasoning_level: Some(ReasoningEffort::Medium),
             supported_reasoning_levels: vec![
                 ReasoningEffortPreset {
                     effort: ReasoningEffort::Low,
@@ -76,14 +76,16 @@ async fn models_client_hits_models_endpoint() {
             supported_in_api: true,
             priority: 1,
             upgrade: None,
-            base_instructions: None,
+            base_instructions: "base instructions".to_string(),
             supports_reasoning_summaries: false,
             support_verbosity: false,
             default_verbosity: None,
             apply_patch_tool_type: None,
             truncation_policy: TruncationPolicyConfig::bytes(10_000),
             supports_parallel_tool_calls: false,
-            context_window: None,
+            context_window: Some(272_000),
+            auto_compact_token_limit: None,
+            effective_context_window_percent: 95,
             experimental_supported_tools: Vec::new(),
         }],
     };