When spawning polecats in non-gastown rigs like beads, the agent bead ID
was incorrectly using the hardcoded "gt-" prefix instead of the rig's
configured prefix (e.g., "bd-" for beads).
Changes:
- Add GetPrefixForRig() in routes.go to look up prefix from routes.jsonl
- Update agentIDToBeadID() in sling.go to use rig's prefix via the new
*WithPrefix functions instead of hardcoded "gt"
- Add unit tests for the new functionality
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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