Rename description.json to description.md for dataset

Author: rob-metalinkage

.agents/.agent.md

@@ -31,7 +31,7 @@ Capabilities:
       - If a property has no authoritative vocabulary match, document the gap and suggest a custom term.
   11. Generate OGC building block elements according to the official OGC incubator structure:
       - `bblock.json`
-      - `description.json` for dataset description
+      - `description.md` for dataset description
       - `schema.json` or `schema.yaml`
       - `context.jsonld`
       - `examples/` with sample data
@@ -66,4 +66,4 @@ When to pick this agent:
 - The user wants vocabulary recommendations, format conversions, or enhanced metadata for GIS content.
 - The work spans both GIS data structure and semantic interoperability.
 
-Do not use this agent for unrelated tasks such as generic programming fixes, UI-only changes, or non-geospatial content generation.
+Do not use this agent for unrelated tasks such as generic programming fixes, UI-only changes, or non-geospatial content generation.