Add superseded note to parent CGDSL README

Update README files for repaired CGDSL overlay

Add regenerated CGDSL overlay 20260307-081439

CGDSL build upload: records=506992

Update README to full CGDSL v1.0 structure + validation status

Add README documenting corrected cghd_hf.jsonl structure and semantics

Replace cghd_hf.jsonl with fixed render-linkage/canvas-consistent build

CGDSL build upload: records=506992

CGDSL build upload: records=506982