Support disabling tool suggest for specific tools. (#20072)

## Summary
- Add `disable_tool_suggest` to app and plugin config, schema, and
TypeScript output
- Exclude disabled connectors and plugins from tool suggestion discovery
- Persist "never show again" tool-suggestion choices back into
`config.toml`
- Update config docs and add coverage for connector and plugin
suppression

## Testing
- Added and updated unit tests for config persistence and tool-suggest
filtering
- Not run (not requested)

codex-rs/core/src/session/mod.rs

@@ -18,6 +18,7 @@ use crate::build_available_skills;
 use crate::commit_attribution::commit_message_trailer_instruction;
 use crate::compact;
 use crate::config::ManagedFeatures;
+use crate::config::resolve_tool_suggest_config_from_layer_stack;
 use crate::connectors;
 use crate::context::ApprovedCommandPrefixSaved;
 use crate::context::AppsInstructions;
@@ -1407,6 +1408,8 @@ impl Session {
         config.config_layer_stack = config
             .config_layer_stack
             .with_user_config(&config_toml_path, user_config);
+        config.tool_suggest =
+            resolve_tool_suggest_config_from_layer_stack(&config.config_layer_stack);
         state.session_configuration.original_config_do_not_use = Arc::new(config);
         self.services.skills_manager.clear_cache();
         self.services.plugins_manager.clear_cache();