Call beads.EnsureCustomTypes before attempting to create a convoy.
This fixes invalid issue type: convoy errors that occur when town
beads do not have custom types configured (e.g., incomplete install
or manually initialized beads).
The EnsureCustomTypes function uses caching (in-memory + sentinel file)
so this adds negligible overhead to convoy create.
Fixes: gt-1b8eg9
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
73d577e3c3