Pure functional core (PRD ViktorBarzin/infra#9 modules #1 roster engine + #5 offboarding diff) that the bash provisioner will consume as JSON: roster parse/validate, fail-loud tier-vs-k8s_users check, sticky-port + ttyd-map + dispatch derivation, additive-only group reconcile, and the staged offboarding diff (reversible cut vs gated userdel, never auto). 27 pytest cases, ruff-clean; no host I/O in the tested path. Verified to reproduce the live dispatch.json byte-for-byte from the real roster.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
