v2.1.1: fix developer role mapping for DeepSeek and other providers

src/codex-launcher-gui

@@ -24,6 +24,12 @@ model_catalog_json = ""
 """
 
 CHANGELOG = [
+    ("2.1.1", "2026-05-19", [
+        "Fixed proxy: map 'developer' role to 'system' for Chat Completions providers",
+        "Fixed proxy: map 'developer' role to 'user' for Anthropic providers",
+        "Forward 'instructions' field from Responses API as system message/param",
+        "Fixes DeepSeek and other providers rejecting unknown 'developer' role",
+    ]),
     ("2.1.0", "2026-05-19", [
         "Added Codex auth status detection (codex login status)",
         "Added Re-login button to re-authenticate via codex login",
@@ -494,7 +500,7 @@ class LauncherWin(Gtk.Window):
         # header row
         hdr = Gtk.Box(spacing=8)
         vbox.pack_start(hdr, False, False, 0)
-        lbl = Gtk.Label(label="<b>Codex Launcher v2.1.0</b>")
+        lbl = Gtk.Label(label="<b>Codex Launcher v2.1.1</b>")
         lbl.set_use_markup(True)
         hdr.pack_start(lbl, False, False, 0)
         changelog_btn = Gtk.Button(label="Changelog")