add-annotation

Add a new @AI... guardrail annotation to VibeTags — register it in GuardrailAnnotations, then wire it through every platform renderer, GranularRenderer, BuildFingerprint, and AnnotationValidator, and update all four docs. Use when the user says "add annotation", "new @AI annotation", "add a new guardrail annotation", or wants VibeTags to support a new kind of AI instruction on Java code.