add changelog entry

Author: dsp-ant

docs/specification/draft/changelog.mdx

@@ -28,7 +28,7 @@ the previous revision, [2025-11-25](/specification/2025-11-25).
 
 ## Other schema changes
 
-N/A
+1. `schema.json` now correctly reflects that the Typescript definition of wminimum/maximum/default are `number`'s and not just `integers`. This was casued by using the generator using `--defaultNumberType integer` ([PR#2710](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2710)).
 
 ## Governance and process updates