refactor: enhance test framework with automated resource tracking and scripted error capture capabilities

addons/godot_ai/testing/loggers/.gdignore

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+

addons/godot_ai/testing/loggers/script_error_capture.gd

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+@tool
+extends Logger
+
+## Captures GDScript runtime errors emitted while a test is running.
+##
+## Deliberately no class_name: this script is compiled dynamically by
+## script_error_capture_loader.gd only when Logger exists. It lives in a
+## `.gdignore`d folder so older Godot editor scans never parse `extends Logger`.
+##
+## Only ERROR_TYPE_SCRIPT is captured. push_error(), push_warning(), and
+## engine-internal ERR_FAIL_* checks are often valid negative-path assertions and
+## should not abort the test.
+
+var _mutex := Mutex.new()
+var _capturing := false
+var _errors := PackedStringArray()
+
+
+func begin_capture() -> void:
+	_mutex.lock()
+	_capturing = true
+	_errors.clear()
+	_mutex.unlock()
+
+
+func end_capture() -> PackedStringArray:
+	_mutex.lock()
+	var captured := _errors.duplicate()
+	_capturing = false
+	_errors.clear()
+	_mutex.unlock()
+	return captured
+
+
+func _log_error(
+	function: String,
+	file: String,
+	line: int,
+	code: String,
+	rationale: String,
+	_editor_notify: bool,
+	error_type: int,
+	_script_backtraces: Array,
+) -> void:
+	if error_type != ERROR_TYPE_SCRIPT:
+		return
+	_mutex.lock()
+	if _capturing:
+		var text := rationale if not rationale.is_empty() else code
+		_errors.append("%s (%s:%d in %s)" % [text, file, line, function])
+	_mutex.unlock()