Fix pipe character rendering as table in ToolClad post

Replace | with em dash to prevent kramdown from interpreting
the author byline as a markdown table.

Author: jaschadub

blog/_posts/2026-04-03-introducing-toolclad-declarative-tool-contracts.md

@@ -8,7 +8,7 @@ tags: [toolclad, ai agents, security, tool contracts, mcp, cedar, symbiont, trus
 
 *Introducing ToolClad: Declarative Tool Interface Contracts for Agentic Runtimes*
 
-**Jascha Wanger | ThirdKey AI Research**
+**Jascha Wanger — ThirdKey AI Research**
 
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