The env-vars check was using AgentEnvSimple which doesn't know the
actual TownRoot and BeadsDir paths. This could cause false positive
mismatches when comparing expected (empty paths) vs actual (real paths).
- Use config.AgentEnv with proper TownRoot and BeadsDir from CheckContext
- Rig-level roles resolve beads dir from rig path
- Update tests to use expectedEnv helper that generates full env vars
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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