Gate plugin usage instructions by model capability (#36792)

## What changed

- Add `include_plugin_usage_instructions` to model metadata, defaulting to false.
- Emit generic plugin guidance only when plugins are available and the selected model enables it.
- Enable the capability for interactive model presets while leaving `codex-auto-review` opted out.

GitOrigin-RevId: 67f5a97e978033f5f1d533956c0b9deeae610283

codex-rs/core/tests/suite/auto_review.rs

@@ -270,6 +270,7 @@ fn remote_model_with_auto_review_override(slug: &str, review_model: &str) -> Mod
         upgrade: None,
         model_messages: None,
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,

codex-rs/core/tests/suite/model_switching.rs

@@ -99,6 +99,7 @@ fn test_model_info(
         upgrade: None,
         model_messages: None,
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,
@@ -962,6 +963,7 @@ async fn model_switch_to_smaller_model_updates_token_context_window() -> Result<
         upgrade: None,
         model_messages: None,
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,

codex-rs/core/tests/suite/models_cache_ttl.rs

@@ -512,6 +512,7 @@ fn test_remote_model(slug: &str, priority: i32) -> ModelInfo {
             token_budget: None,
         }),
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,

codex-rs/core/tests/suite/personality.rs

@@ -647,6 +647,7 @@ async fn remote_model_friendly_personality_instructions_with_feature() -> anyhow
             token_budget: None,
         }),
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,
@@ -767,6 +768,7 @@ async fn user_turn_personality_remote_model_template_includes_update_message() -
             token_budget: None,
         }),
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,

codex-rs/core/tests/suite/remote_models.rs

@@ -537,6 +537,7 @@ async fn remote_models_remote_model_uses_unified_exec() -> Result<()> {
         upgrade: None,
         model_messages: None,
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,
@@ -798,6 +799,7 @@ async fn remote_models_apply_legacy_instructions() -> Result<()> {
             token_budget: None,
         }),
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,
@@ -1372,6 +1374,7 @@ fn test_remote_model_with_policy(
         upgrade: None,
         model_messages: None,
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,

codex-rs/core/tests/suite/rmcp_client.rs

@@ -2261,6 +2261,7 @@ async fn stdio_image_responses_are_sanitized_for_text_only_model() -> anyhow::Re
                 upgrade: None,
                 model_messages: None,
                 include_skills_usage_instructions: false,
+                include_plugin_usage_instructions: false,
                 supports_reasoning_summary_parameter: true,
                 default_reasoning_summary: ReasoningSummary::Auto,
                 support_verbosity: false,

codex-rs/core/tests/suite/spawn_agent_description.rs

@@ -80,6 +80,7 @@ fn test_model_info(
         upgrade: None,
         model_messages: None,
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,

codex-rs/core/tests/suite/view_image.rs

@@ -1372,6 +1372,7 @@ async fn view_image_tool_returns_unsupported_message_for_text_only_model() -> an
         upgrade: None,
         model_messages: None,
         include_skills_usage_instructions: false,
+        include_plugin_usage_instructions: false,
         supports_reasoning_summary_parameter: true,
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,