58939d1dc6
Bumps the milestone version + writes the operator-facing release notes covering the complete tier-upgrades feature delivered across8ce78ab(Phase 1 schema),f8affdb(Phase 2 quote/apply),b7fa6c7(Phase 3 buyer endpoints + webhook),c5d716a(Phase 4 admin endpoint + renewal-worker hook), andfb062d5(Phase 5 admin UI). Test count callout: 77 (was 57 at v0.2.0:4).