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Update docs to reflect the centralized config.AgentEnv() function and complete environment variable coverage: reference.md: - Restructured env vars section with tables by category - Added GT_ROOT, GT_CREW, BEADS_AGENT_NAME documentation - Added "Environment by Role" quick reference table - Added doctor check documentation for env-vars validation identity.md: - Updated Environment Setup section with complete examples - Added crew environment example showing BEADS_NO_DAEMON - Mentioned centralized config.AgentEnv() function - Cross-referenced to reference.md for full details Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>