- New gt role subcommands: show, home, detect, list, env
- Role detection now checks GT_ROLE env var first, falls back to cwd
- gt prime shows warning when role/cwd mismatch detected
- gt mol status uses env-aware role detection
- gt handoff injects GT_ROLE and resets to role canonical home
- Fixed witness/refinery home paths (was missing /rig suffix)
This prevents role confusion when agents wander to wrong directories.
After handoff, agents are always restored to their canonical home.
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