elevate: move adapter auto-start from sandboxed client to Go server

Remove _start_adapter() from x/elevate (ran inside sandbox, could not
function). The Go executeElevated() now calls ensureElevateAdapter()
which runs outside the sandbox and can properly start the adapter.

core: update submodule.

core

@@ -1 +1 @@
-Subproject commit 6f35059d83653328a0cead1df414f2f1192faa45
+Subproject commit 519869a00360ffb8b6ff5e2e21902d84d937e271

scripts/x/elevate

@@ -37,23 +37,6 @@ def recv_exact(sock, n):
     return buf
 
 
-def _start_adapter():
-    """Try to start the elevate adapter in the background."""
-    import subprocess
-    import time
-    cfg = os.environ.get("OLLIE_CFG_PATH") or os.path.expanduser("~/.config/ollie")
-    start_script = os.path.join(cfg, "scripts", "x", "elevate-adapter-start")
-    if not os.path.exists(start_script):
-        return False
-    try:
-        subprocess.run([start_script], timeout=5, capture_output=True)
-    except (subprocess.TimeoutExpired, OSError):
-        return False
-    # Wait briefly for socket to appear
-    time.sleep(0.3)
-    return True
-
-
 def main():
     sock_path = os.environ.get("OLLIE_ELEVATE_SOCKET") or default_socket_path()
 
@@ -66,18 +49,9 @@ def main():
     sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
     try:
         sock.connect(sock_path)
-    except OSError:
-        # Adapter not running — try to start it and retry
-        if _start_adapter():
-            sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-            try:
-                sock.connect(sock_path)
-            except OSError as e:
-                print(f"elevate: connect {sock_path}: {e} (after adapter start)", file=sys.stderr)
-                sys.exit(1)
-        else:
-            print(f"elevate: connect {sock_path}: adapter not running and failed to start", file=sys.stderr)
-            sys.exit(1)
+    except OSError as e:
+        print(f"elevate: connect {sock_path}: [Errno {e.errno}] {e.strerror}", file=sys.stderr)
+        sys.exit(1)
 
     with sock:
         sock.sendall(req)