feat(orchestrator): create_skill action + wire per-project watchers (§14.3)

- domain: OrchestratorCommand::CreateSkill with optional scope field
  (defaults to Project, case-insensitive, UnknownScope on bad value)
- application: dispatch CreateSkill through the CreateSkill use case
- app-tauri: build OrchestratorService and start/stop per-project request
  watchers on open/create/close_project (ensure/stop_orchestrator_watch)
- tests: domain validation, service dispatch, infra watcher e2e,
  app-tauri wiring lifecycle (idempotent, isolated, stop)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/app-tauri/src/commands.rs

@@ -68,12 +68,15 @@ pub async fn create_project(
     request: CreateProjectRequestDto,
     state: State<'_, AppState>,
 ) -> Result<ProjectDto, ErrorDto> {
-    state
+    let output = state
         .create_project
         .execute(request.into())
         .await
-        .map(ProjectDto::from)
-        .map_err(ErrorDto::from)
+        .map_err(ErrorDto::from)?;
+    // Start tailing this project's `.ideai/requests/` tree so an orchestrator
+    // agent can delegate agent/skill creation to IdeA (§14.3).
+    state.ensure_orchestrator_watch(&output.project);
+    Ok(ProjectDto::from(output))
 }
 
 /// `open_project` — load a project and its `.ideai/` meta/manifest.
@@ -87,12 +90,14 @@ pub async fn open_project(
     state: State<'_, AppState>,
 ) -> Result<ProjectDto, ErrorDto> {
     let id = parse_project_id(&project_id)?;
-    state
+    let output = state
         .open_project
         .execute(OpenProjectInput { project_id: id })
         .await
-        .map(ProjectDto::from)
-        .map_err(ErrorDto::from)
+        .map_err(ErrorDto::from)?;
+    // (Re)start the orchestrator watcher for this project (idempotent, §14.3).
+    state.ensure_orchestrator_watch(&output.project);
+    Ok(ProjectDto::from(output))
 }
 
 /// `close_project` — persist state and release resources for a project.
@@ -105,6 +110,8 @@ pub async fn close_project(
     state: State<'_, AppState>,
 ) -> Result<(), ErrorDto> {
     let id = parse_project_id(&project_id)?;
+    // Stop tailing this project's `.ideai/requests/` tree (§14.3).
+    state.stop_orchestrator_watch(&id);
     state
         .close_project
         .execute(CloseProjectInput {