fix(pipeline): fetch issue name from Plane API on status-trigger start

issue.updated ships only the changed fields, so name was absent and the branch slug became feature/<id>-untitled. Add fetch_issue_fields (single issue-detail GET returning name+description, reusing the endpoint/token of fetch_issue_description) and pull the name above the slug build. Empty name still falls back to untitled.

src/plane_sync.py

@@ -197,6 +197,42 @@ def fetch_issue_description(issue_id: str, project_id: str) -> str:
         return ""
 
 
+def fetch_issue_fields(issue_id: str, project_id: str) -> tuple[str, str]:
+    """BUG B: GET the Plane issue by UUID ONCE and return (name, description).
+
+    Plane's ``issue.updated`` webhook (e.g. a status change) only carries the
+    CHANGED fields, so BOTH ``name`` and ``description`` are usually absent in
+    the payload. start_pipeline needs the real title (for the branch slug) and
+    the real description (for the analyst .task.md). To avoid issuing two
+    separate issue-detail GETs (one for name, one for description), this single
+    request returns both.
+
+    Reuses the exact GET issue detail endpoint / shared token already used by
+    ``fetch_issue_sequence_id`` / ``fetch_issue_description``. For the
+    description it applies the same logic as ``fetch_issue_description``
+    (prefer ``description_stripped``, fall back to stripping
+    ``description_html``).
+
+    Returns ("", "") on network error, non-2xx, or missing body - never raises,
+    so a Plane outage degrades gracefully (caller keeps its payload fallbacks).
+    """
+    url = f"{PLANE_BASE}/workspaces/{WORKSPACE}/projects/{project_id}/issues/{issue_id}/"
+    try:
+        resp = httpx.get(url, headers=PLANE_HEADERS, timeout=10)
+        resp.raise_for_status()
+        body = resp.json()
+        name = (body.get("name") or "").strip()
+        desc = body.get("description_stripped")
+        if desc and desc.strip():
+            description = desc
+        else:
+            description = _strip_html(body.get("description_html") or "")
+        return name, description
+    except Exception as e:
+        logger.warning(f"fetch_issue_fields failed for {issue_id}: {e}")
+        return "", ""
+
+
 def find_issue_id(work_item_id: str, project_id: str = None) -> str | None:
     """Find Plane issue UUID by work_item_id (e.g. 'ET-002')."""
     project_id = _resolve_project_id(work_item_id, project_id)