Stamp

Stamp is a utility MCP for agents and pipelines that need reliable attribution primitives they cannot safely produce themselves. 6 commands. *NOTE* Canonicalization change: records attested before this change on September 11th won't verify under JCS, the hash input changed. That's inherent to fixing the canonicalization, old records were only verifiable against Python's json.dumps. 1. *calculate*: evaluates math expressions in a sandboxed AST evaluator. Agents offload arithmetic here rather t