Not converted in this pass — scope-reduced under time constraints, not silently dropped.

Source docs: `~/Downloads/ADMIN_Tier_Plans_Test_Case_Documentation.txt` and
`~/Downloads/Client_Tier_Plans_Test_Case_Documentation.txt`.
Source scripts to port from (chibistar/automation/starr/): `test-tier-plans-admin.cjs` (417 lines),
`test-tier-plans-e2e.cjs` (520 lines), `test-tier-plan-inactive.cjs` (171 lines),
`test-client-tier-plans-live.cjs` (164 lines) — ~1270 lines total. Follow the same
conversion pattern used in `../courses/admin.spec.js` and `../advertisements/admin.spec.js`.
Note `test-client-tier-plans-live.cjs` targets the LIVE_URL and hardcodes real
live user_ids/plan state — will need the same "rebuild against localhost with
fresh fixtures" treatment as the other client-side specs, not a literal port.