Introduces config.RoleEnvVars() as the single source of truth for role
identity environment variables (GT_ROLE, GT_RIG, BD_ACTOR, etc.).
CLI improvements:
- Fix getRoleHome paths (witness has no /rig suffix, polecat/crew do)
- Make gt role env read-only (displays current role from env/cwd)
- Add EnvIncomplete handling: fill missing env vars from cwd with warning
- Add cwd mismatch warnings when not in role home directory
- gt role home now validates --polecat requires --rig
Includes comprehensive e2e tests for all role detection scenarios.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
