Three issues were causing errors when running `gt rig add`:
1. **bd init flag**: Removed non-existent `--no-agents` flag from bd init
command that was causing silent failures.
2. **BEADS_DIR for init**: Added explicit BEADS_DIR to bd init and migrate
commands to prevent bd from finding parent directory databases.
3. **Agent beads location**: Agent beads now go in town beads (gt-* prefix)
instead of rig beads. This is necessary because:
- Agent IDs use canonical gt-* prefix (e.g., gt-tribal-witness)
- Rig beads use rig-specific prefixes (e.g., tr-*)
- bd strictly validates ID prefix against database prefix
- Town beads must be initialized with `gt` prefix
4. **beads.run() BEADS_DIR**: Modified to explicitly pass BEADS_DIR in child
process environment to ensure bd uses the correct database.
5. **Agent ID prefix**: Use WitnessBeadID/RefineryBeadID (canonical gt-*)
instead of WithPrefix variants.
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Co-Authored-By: Claude <noreply@anthropic.com>
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