Document which Runner executors are actively developed, in maintenance mode, or deprecated, along with their feature compatibility. Documentation should clearly guide customers toward actively developed executors: instance, instance autoscaler, docker, docker autoscaler, and Kubernetes ## Goals - Create clear documentation on executor support status and feature compatibility - Provide migration paths for customers using deprecated executors - Reduce maintenance burden on deprecated executor code For more information, see https://gitlab.slack.com/archives/C0199KBMY59/p1774357138156369, https://gitlab.slack.com/archives/C0199KBMY59/p1774524786825859.