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, 171 insertions, 0 deletions

diff --git a/internal/api/elaborate_test.go b/internal/api/elaborate_test.go
new file mode 100644
index 0000000..ff158a8
--- /dev/null
+++ b/internal/api/elaborate_test.go
@@ -0,0 +1,171 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// createFakeClaude writes a shell script to a temp dir that prints output and exits with the
+// given code. Returns the script path. Used to mock the claude binary in elaborate tests.
+func createFakeClaude(t *testing.T, output string, exitCode int) string {
+	t.Helper()
+	dir := t.TempDir()
+	outputFile := filepath.Join(dir, "output.json")
+	if err := os.WriteFile(outputFile, []byte(output), 0600); err != nil {
+		t.Fatal(err)
+	}
+	script := filepath.Join(dir, "claude")
+	content := fmt.Sprintf("#!/bin/sh\ncat %q\nexit %d\n", outputFile, exitCode)
+	if err := os.WriteFile(script, []byte(content), 0755); err != nil {
+		t.Fatal(err)
+	}
+	return script
+}
+
+func TestElaborateTask_Success(t *testing.T) {
+	srv, _ := testServer(t)
+
+	// Build fake Claude output: {"result": "<task-json>"}
+	task := elaboratedTask{
+		Name:        "Run Go tests with race detector",
+		Description: "Runs the Go test suite with -race flag and checks coverage.",
+		Claude: elaboratedClaude{
+			Model:        "sonnet",
+			Instructions: "Run go test -race ./... and report results.",
+			WorkingDir:   "",
+			MaxBudgetUSD: 0.5,
+			AllowedTools: []string{"Bash"},
+		},
+		Timeout:  "15m",
+		Priority: "normal",
+		Tags:     []string{"testing", "ci"},
+	}
+	taskJSON, err := json.Marshal(task)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wrapper := map[string]string{"result": string(taskJSON)}
+	wrapperJSON, err := json.Marshal(wrapper)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	srv.elaborateCmdPath = createFakeClaude(t, string(wrapperJSON), 0)
+
+	body := `{"prompt":"run the Go test suite with race detector and fail if coverage < 80%"}`
+	req := httptest.NewRequest("POST", "/api/tasks/elaborate", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: want 200, got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var result elaboratedTask
+	if err := json.NewDecoder(w.Body).Decode(&result); err != nil {
+		t.Fatalf("failed to decode response: %v", err)
+	}
+	if result.Name == "" {
+		t.Error("expected non-empty name")
+	}
+	if result.Claude.Instructions == "" {
+		t.Error("expected non-empty instructions")
+	}
+}
+
+func TestElaborateTask_EmptyPrompt(t *testing.T) {
+	srv, _ := testServer(t)
+
+	body := `{"prompt":""}`
+	req := httptest.NewRequest("POST", "/api/tasks/elaborate", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("status: want 400, got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var resp map[string]string
+	json.NewDecoder(w.Body).Decode(&resp)
+	if resp["error"] == "" {
+		t.Error("expected error message in response")
+	}
+}
+
+func TestElaborateTask_MarkdownFencedJSON(t *testing.T) {
+	srv, _ := testServer(t)
+
+	// Build a valid task JSON but wrap it in markdown fences as haiku sometimes does.
+	task := elaboratedTask{
+		Name:        "Test task",
+		Description: "Does something.",
+		Claude: elaboratedClaude{
+			Model:        "sonnet",
+			Instructions: "Do the thing.",
+			MaxBudgetUSD: 0.5,
+			AllowedTools: []string{"Bash"},
+		},
+		Timeout:  "15m",
+		Priority: "normal",
+		Tags:     []string{"test"},
+	}
+	taskJSON, _ := json.Marshal(task)
+	fenced := "```json\n" + string(taskJSON) + "\n```"
+	wrapper := map[string]string{"result": fenced}
+	wrapperJSON, _ := json.Marshal(wrapper)
+
+	srv.elaborateCmdPath = createFakeClaude(t, string(wrapperJSON), 0)
+
+	body := `{"prompt":"do something"}`
+	req := httptest.NewRequest("POST", "/api/tasks/elaborate", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: want 200, got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var result elaboratedTask
+	if err := json.NewDecoder(w.Body).Decode(&result); err != nil {
+		t.Fatalf("failed to decode response: %v", err)
+	}
+	if result.Name != task.Name {
+		t.Errorf("name: want %q, got %q", task.Name, result.Name)
+	}
+}
+
+func TestElaborateTask_InvalidJSONFromClaude(t *testing.T) {
+	srv, _ := testServer(t)
+
+	// Fake Claude returns something that is not valid JSON.
+	srv.elaborateCmdPath = createFakeClaude(t, "not valid json at all", 0)
+
+	body := `{"prompt":"do something"}`
+	req := httptest.NewRequest("POST", "/api/tasks/elaborate", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	srv.Handler().ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadGateway {
+		t.Fatalf("status: want 502, got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var resp map[string]string
+	json.NewDecoder(w.Body).Decode(&resp)
+	if resp["error"] == "" {
+		t.Error("expected error message in response")
+	}
+}