The ValidateAgentID function was hardcoded to only accept 'gt-' prefix,
but beads rig uses 'bd-' prefix. Now accepts any valid prefix.
Changes:
- Extract prefix dynamically instead of hardcoding 'gt-'
- Accept IDs like bd-mayor, bd-beads-polecat-pearl
- Update error messages to be prefix-agnostic
- Add test cases for alternative prefixes
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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