Agent bead ID validation was hardcoded to only accept "gt-" prefix, which
caused errors when spawning beads polecats (which use "bd-" prefix):
Error: invalid agent ID: agent ID must start with 'gt-' (got "bd-beads-polecat-pearl")
Changed ParseAgentBeadID to accept any 2-3 character prefix (gt-, bd-, hq-)
instead of hardcoding "gt-". Updated tests to cover other prefixes.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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