Add elaborate, logs-stream, templates, and subtask-list endpoints

- POST /api/tasks/elaborate: calls claude to draft a task config from
  a natural-language prompt
- GET  /api/executions/{id}/logs/stream: SSE tail of stdout.log
- CRUD /api/templates: create/list/get/update/delete reusable task configs
- GET  /api/tasks/{id}/subtasks: list child tasks
- Server.NewServer accepts claudeBinPath for elaborate; injectable
  elaborateCmdPath and logStore for test isolation
- Valid-transition guard added to POST /api/tasks/{id}/run
- CLI passes claude binary path through to the server

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 83 insertions, 1 deletions

diff --git a/internal/api/server_test.go b/internal/api/server_test.go
index 1628636..68f3657 100644
--- a/internal/api/server_test.go
+++ b/internal/api/server_test.go
@@ -30,7 +30,7 @@ func testServer(t *testing.T) (*Server, *storage.DB) {
 	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
 	runner := &mockRunner{}
 	pool := executor.NewPool(2, runner, store, logger)
-	srv := NewServer(store, pool, logger)
+	srv := NewServer(store, pool, logger, "claude")
 	return srv, store
 }
 
@@ -170,6 +170,88 @@ func TestListTasks_WithTasks(t *testing.T) {
 	}
 }
 
+func createTaskWithState(t *testing.T, store *storage.DB, id string, state task.State) *task.Task {
+	t.Helper()
+	tk := &task.Task{
+		ID:    id,
+		Name:  "test-task-" + id,
+		Claude: task.ClaudeConfig{Instructions: "do something"},
+		Priority: task.PriorityNormal,
+		Retry: task.RetryConfig{MaxAttempts: 1, Backoff: "linear"},
+		Tags: []string{}, DependsOn: []string{}, State: task.StatePending,
+	}
+	if err := store.CreateTask(tk); err != nil {
+		t.Fatalf("createTaskWithState: CreateTask: %v", err)
+	}
+	if state != task.StatePending {
+		if err := store.UpdateTaskState(id, state); err != nil {
+			t.Fatalf("createTaskWithState: UpdateTaskState(%s): %v", state, err)
+		}
+	}
+	tk.State = state
+	return tk
+}
+
+func TestRunTask_PendingTask_Returns202(t *testing.T) {
+	srv, store := testServer(t)
+	createTaskWithState(t, store, "run-pending", task.StatePending)
+
+	req := httptest.NewRequest("POST", "/api/tasks/run-pending/run", nil)
+	w := httptest.NewRecorder()
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusAccepted {
+		t.Errorf("status: want 202, got %d; body: %s", w.Code, w.Body.String())
+	}
+}
+
+func TestRunTask_FailedTask_Returns202(t *testing.T) {
+	srv, store := testServer(t)
+	createTaskWithState(t, store, "run-failed", task.StateFailed)
+
+	req := httptest.NewRequest("POST", "/api/tasks/run-failed/run", nil)
+	w := httptest.NewRecorder()
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusAccepted {
+		t.Errorf("status: want 202, got %d; body: %s", w.Code, w.Body.String())
+	}
+}
+
+func TestRunTask_TimedOutTask_Returns202(t *testing.T) {
+	srv, store := testServer(t)
+	// TIMED_OUT → QUEUED is a valid transition (retry path).
+	// We need to get the task into TIMED_OUT state; storage allows direct state writes.
+	createTaskWithState(t, store, "run-timedout", task.StateTimedOut)
+
+	req := httptest.NewRequest("POST", "/api/tasks/run-timedout/run", nil)
+	w := httptest.NewRecorder()
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusAccepted {
+		t.Errorf("status: want 202, got %d; body: %s", w.Code, w.Body.String())
+	}
+}
+
+func TestRunTask_CompletedTask_Returns409(t *testing.T) {
+	srv, store := testServer(t)
+	createTaskWithState(t, store, "run-completed", task.StateCompleted)
+
+	req := httptest.NewRequest("POST", "/api/tasks/run-completed/run", nil)
+	w := httptest.NewRecorder()
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusConflict {
+		t.Errorf("status: want 409, got %d; body: %s", w.Code, w.Body.String())
+	}
+	var body map[string]string
+	json.NewDecoder(w.Body).Decode(&body)
+	wantMsg := "task cannot be queued from state COMPLETED"
+	if body["error"] != wantMsg {
+		t.Errorf("error body: want %q, got %q", wantMsg, body["error"])
+	}
+}
+
 func TestCORS_Headers(t *testing.T) {
 	srv, _ := testServer(t)