feat: register supports_terminal CLI feature flag

Add a registered, bool-typed supports_terminal flag so a terminal host
(e.g. ComfyUI Desktop) can advertise interactive-terminal availability to
the frontend via --feature-flag supports_terminal=true. Registration is
required so the value coerces to a real boolean; the frontend gates the
terminal UI on a strict === true check.

Amp-Thread-ID: https://ampcode.com/threads/T-019e9464-f097-7430-a762-405ffb717dae
Co-authored-by: Amp <amp@ampcode.com>

comfy_api/feature_flags.py

@@ -25,6 +25,11 @@ CLI_FEATURE_FLAG_REGISTRY: dict[str, FeatureFlagInfo] = {
         "default": False,
         "description": "Show the sign-in button in the frontend even when not signed in",
     },
+    "supports_terminal": {
+        "type": "bool",
+        "default": False,
+        "description": "An interactive terminal host is available for this server (e.g. ComfyUI Desktop), so the frontend may surface a terminal/console UI",
+    },
 }
 
 

tests-unit/feature_flags_test.py

@@ -181,3 +181,12 @@ class TestCliFeatureFlagRegistry:
             assert "type" in info, f"{key} missing 'type'"
             assert "default" in info, f"{key} missing 'default'"
             assert "description" in info, f"{key} missing 'description'"
+
+    def test_supports_terminal_registered_as_bool(self):
+        """supports_terminal must be a registered bool so --feature-flag
+        supports_terminal=true coerces to a real boolean. The frontend gates
+        on a strict `=== true` check, so a raw string 'true' would not work."""
+        assert "supports_terminal" in CLI_FEATURE_FLAG_REGISTRY
+        assert CLI_FEATURE_FLAG_REGISTRY["supports_terminal"]["type"] == "bool"
+        assert _coerce_flag_value("supports_terminal", "true") is True
+        assert _coerce_flag_value("supports_terminal", "false") is False