[feat]. Add username and custom bot mention tags

tests/test_config.py

@@ -11,3 +11,16 @@ def test_codex_auth_defaults_to_api_key_mode() -> None:
     settings = get_settings()
     assert settings.codex_auth_mode == "api_key"
     assert settings.codex_auth_json_path is None
+
+
+def test_bot_command_aliases_include_codex_and_username() -> None:
+    settings = get_settings()
+    assert settings.bot_command_aliases == {"codex", "codex-bot"}
+
+
+def test_bot_command_aliases_include_custom_mentions(monkeypatch) -> None:
+    monkeypatch.setenv("GITEA_BOT_MENTIONS", "@review-buddy,helper-bot")
+    get_settings.cache_clear()
+
+    settings = get_settings()
+    assert settings.bot_command_aliases == {"codex", "codex-bot", "review-buddy", "helper-bot"}