feat(plugins): hot reload des plugins sans relancer IdeA — use case ReloadPlugin (invalidation registry/catalogue, resultat hashes+changed), tools MCP d'administration plugin agent-facing (mcp/plugins.rs + PluginToolProvider), evenement domaine plugin_reloaded relaye sur le wire (dto/events), exposition openai_tools rafraichie, wiring app-tauri — #271/#269 (QA verte #273: application 32, mcp_server 38, openai_tools 10, plugin_install_load 5, plugin 10, wire 1 — 96 tests ciblés; app-tauri compile sans desktop runtime)

crates/app-tauri/src/lib.rs

@@ -410,6 +410,7 @@ pub fn run() {
             plugins::plugin_review_package,
             plugins::plugin_install_from_archive,
             plugins::plugin_install_from_directory,
+            plugins::plugin_reload,
             plugins::plugin_set_enabled,
             plugins::plugin_uninstall,
             plugins::plugin_list_runtime_contributions,

crates/app-tauri/src/plugins.rs

@@ -9,12 +9,13 @@ use backend::dto::{
     PluginConfigDocumentUpdateDto, PluginConfigDocumentWriteResultDto, PluginEventBatchDto,
     PluginEventPollDto, PluginEventSubscribeDto, PluginEventSubscriptionDto,
     PluginEventUnsubscribeDto, PluginInstallResultDto, PluginProjectStructureDto,
-    PluginProjectStructureQueryDto, PluginReviewDto, PluginRunCommandDto,
+    PluginProjectStructureQueryDto, PluginReloadResultDto, PluginReviewDto, PluginRunCommandDto,
     PluginRuntimeContributionCatalogDto, PluginStorageGetDto, PluginStorageSetDto, PluginTaskDto,
     PluginTaskStatusDto, PluginToolchainDiagnosticDto, PluginToolchainDiagnosticRequestDto,
     PluginUninstallResultDto, PluginWorkspaceBinaryFileDto, PluginWorkspaceDirectoryListingDto,
     PluginWorkspacePathDto, PluginWorkspaceStatDto, PluginWorkspaceTextFileDto,
-    PluginWorkspaceWriteBinaryDto, PluginWorkspaceWriteTextDto, ReviewPluginPackageDto,
+    PluginWorkspaceWriteBinaryDto, PluginWorkspaceWriteTextDto, ReloadPluginDto,
+    ReviewPluginPackageDto,
 };
 use domain::ports::{PluginManifestValidator, PluginPackageStore, PluginRegistryStore};
 use domain::{PluginId, RelativePath};
@@ -122,6 +123,20 @@ pub async fn plugin_install_from_directory(
     result
 }
 
+/// Hot-reloads a plugin from its recorded directory source.
+#[tauri::command]
+pub async fn plugin_reload(
+    input: ReloadPluginDto,
+    state: State<'_, AppState>,
+) -> Result<PluginReloadResultDto, ErrorDto> {
+    state
+        .reload_plugin
+        .execute(input.into())
+        .await
+        .map(PluginReloadResultDto::from)
+        .map_err(ErrorDto::from)
+}
+
 /// Enables or disables a plugin.
 #[tauri::command]
 pub async fn plugin_set_enabled(