The stop hook runs 'gt costs record' which executes 'bd create' to
record session costs. When run from a role subdirectory (e.g., mayor/)
that doesn't have its own .beads database, bd fails with:
'database not initialized: issue_prefix config is missing'
Fix by using workspace.FindFromCwd() to locate the town root and
setting bdCmd.Dir to run bd from there, where the .beads database
exists.
139f3aeba3