When running from a crew workspace, BEADS_DIR is set to the rig's beads
directory. This caused auto-convoy creation to fail because bd would use
the rig's database (prefix=bd) instead of discovering the HQ database
(prefix=hq) from the working directory.
The fix clears BEADS_DIR from the environment when running bd commands
for convoy creation, allowing bd to discover the correct database from
the townBeads directory.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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