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/plugins/discoverable.rs

@@ -43,6 +43,13 @@ pub(crate) async fn list_tool_suggest_discoverable_plugins(
         .filter(|discoverable| discoverable.kind == ToolSuggestDiscoverableType::Plugin)
         .map(|discoverable| discoverable.id.as_str())
         .collect::<HashSet<_>>();
+    let disabled_plugin_ids = config
+        .tool_suggest
+        .disabled_tools
+        .iter()
+        .filter(|disabled_tool| disabled_tool.kind == ToolSuggestDiscoverableType::Plugin)
+        .map(|disabled_tool| disabled_tool.id.as_str())
+        .collect::<HashSet<_>>();
     let marketplaces = plugins_manager
         .list_marketplaces_for_config(config, &[])
         .context("failed to list plugin marketplaces for tool suggestions")?
@@ -56,6 +63,7 @@ pub(crate) async fn list_tool_suggest_discoverable_plugins(
 
         for plugin in marketplace.plugins {
             if plugin.installed
+                || disabled_plugin_ids.contains(plugin.id.as_str())
                 || (!TOOL_SUGGEST_DISCOVERABLE_PLUGIN_ALLOWLIST.contains(&plugin.id.as_str())
                     && !configured_plugin_ids.contains(plugin.id.as_str()))
             {