fix(client): guard battery test against CI on-battery false-fail (S7)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/tests/test_ai_dialogue_sprint26.gd

@@ -689,8 +689,12 @@ func test_hardware_detector_inference_not_suspended_by_default() -> void:
 	var det := _get_detector()
 	if det == null:
 		return
-	# Note: this reads live state — if tests run on battery hardware the result
-	# may reflect a real suspension. We document this as expected.
+	# Skip if CI is running on battery hardware — power state 1 = ON_BATTERY.
+	# Integer literal used: OS.POWERSTATE_* constants don't exist in this build.
+	var pi := _get_platform_info()
+	if pi != null and pi.current_power_state() == 1:
+		push_warning("TestAiDialogueSprint26: system is on battery (state=1) — skipping default-suspended test")
+		return
 	assert_bool(det.is_inference_suspended()).override_failure_message(
 		"is_inference_suspended() must be false when hardware is FULL/plugged (D-138 §8)"
 	).is_false()