fix(docs): normalize board_tokens in +create response for mermaid/whiteboard content (#10)

+update already calls normalizeDocsUpdateResult to surface board_tokens when
markdown contains mermaid/plantuml/whiteboard blocks. +create was missing the
same call, so callers could not know how many whiteboards were created or
retrieve their tokens. One-line fix: call normalizeDocsUpdateResult after
CallMCPTool in DocsCreate.Execute.

shortcuts/doc/docs_create.go

@@ -83,6 +83,7 @@ var DocsCreate = common.Shortcut{
 			return err
 		}
 
+		normalizeDocsUpdateResult(result, runtime.Str("markdown"))
 		runtime.Out(result, nil)
 		return nil
 	},