feat: pass selected project directory to elaborate

The elaborate call now sends working_dir from the Project dropdown.
The backend uses it (falling back to server workDir) when building
the system prompt, so AI-drafted tasks are contextualised to the
selected project.

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

2 files changed, 15 insertions, 5 deletions

diff --git a/internal/api/elaborate.go b/internal/api/elaborate.go
index d275d61..00f3297 100644
--- a/internal/api/elaborate.go
+++ b/internal/api/elaborate.go
@@ -86,7 +86,8 @@ func (s *Server) claudeBinaryPath() string {
 
 func (s *Server) handleElaborateTask(w http.ResponseWriter, r *http.Request) {
 	var input struct {
-		Prompt string `json:"prompt"`
+		Prompt     string `json:"prompt"`
+		WorkingDir string `json:"working_dir"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
 		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid JSON: " + err.Error()})
@@ -97,12 +98,17 @@ func (s *Server) handleElaborateTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	workDir := s.workDir
+	if input.WorkingDir != "" {
+		workDir = input.WorkingDir
+	}
+
 	ctx, cancel := context.WithTimeout(r.Context(), elaborateTimeout)
 	defer cancel()
 
 	cmd := exec.CommandContext(ctx, s.claudeBinaryPath(),
 		"-p", input.Prompt,
-		"--system-prompt", buildElaboratePrompt(s.workDir),
+		"--system-prompt", buildElaboratePrompt(workDir),
 		"--output-format", "json",
 		"--model", "haiku",
 	)
diff --git a/web/app.js b/web/app.js
index 044d779..a3c425e 100644
--- a/web/app.js
+++ b/web/app.js
@@ -950,11 +950,11 @@ async function submitAnswer(taskId, questionId, answer, banner) {
 
 // ── Elaborate (Draft with AI) ─────────────────────────────────────────────────
 
-async function elaborateTask(prompt) {
+async function elaborateTask(prompt, workingDir) {
   const res = await fetch(`${API_BASE}/api/tasks/elaborate`, {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({ prompt }),
+    body: JSON.stringify({ prompt, working_dir: workingDir }),
   });
   if (!res.ok) {
     let msg = `HTTP ${res.status}`;
@@ -1699,7 +1699,11 @@ if (typeof document !== 'undefined') document.addEventListener('DOMContentLoaded
     form.querySelectorAll('.form-error, .elaborate-banner').forEach(el => el.remove());
 
     try {
-      const result = await elaborateTask(prompt);
+      const sel = document.getElementById('project-select');
+      const workingDir = sel.value === '__new__'
+        ? document.getElementById('new-project-input').value.trim()
+        : sel.value;
+      const result = await elaborateTask(prompt, workingDir);
 
       // Populate form fields
       const f = document.getElementById('task-form');