chore(a2ml-migration): rename .scm → .a2ml in lithoglyph + gql-dt

- lithoglyph/.machine_readable/HANDOVER.scm → HANDOVER.a2ml
- lithoglyph/.machine_readable/ROADMAP.scm → ROADMAP.a2ml
- lithoglyph/gql-dt/.machine_readable/ROADMAP.scm → ROADMAP.a2ml

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

Author: hyperpolymath

lithoglyph/.machine_readable/HANDOVER.scm …thoglyph/.machine_readable/HANDOVER.a2mllithoglyph/.machine_readable/HANDOVER.scm renamed to lithoglyph/.machine_readable/HANDOVER.a2ml lithoglyph/.machine_readable/HANDOVER.scm renamed to lithoglyph/.machine_readable/HANDOVER.a2ml

@@ -1,4 +1,4 @@
-;; lith.scm
+;; lith.a2ml
 ;; Lith Unified Handover Artefact (coding-LLM oriented)
 ;;
 ;; Conventions: