fix(examples): remove binary and update gitignore

Remove accidentally committed error-handler binary and add it to .gitignore.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: SebastienMelki

examples/error-handler/.gitignore

@@ -4,6 +4,7 @@ docs/
 
 # Binaries
 bin/
+error-handler
 
 # Go
 *.exe