Agent beads must use gt- prefix (required by beads validation).
Only issue beads use rig-specific prefixes (ga-, bd-, etc.).
Fixed in:
- crew_add.go: Use CrewBeadID() not CrewBeadIDWithPrefix()
- prime.go: Use non-prefix variants for all agent types
- sling.go: Use non-prefix variants for all agent types
This fixes 'invalid agent ID' error when creating crew in rigs
with non-gt prefix (e.g., gastown with ga- prefix).
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>