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- resolve_upgrade_base: BasePlan(kind=version|ref|skip); last-green (warm canonical) primary, main-tip fallback, declared skip else. UPGRADE_BASE_VERSION retained as optional override. - deploy_app: base_ref path (chaos-deploy a main-tip/last-green commit) + apply_previous wiring. - lifecycle: previous/ surface (has_previous, previous_target_version, previous_status decision, provide/remove overlay, compose_file add/remove, recipe_branch_commit, stack_service_names). - generic.perform_upgrade: strip previous/ overlay + COMPOSE_FILE entry before head redeploy. - discourse: compose.ccci.yml now environmental-only (order: stop-first); removed bitnamilegacy pins + sidekiq + UPGRADE_BASE_VERSION; test_upgrade.py asserts head image == official 3.5.3 + no sidekiq. - unit tests: resolve_upgrade_base matrix + previous/ apply/skip/stale + COMPOSE_FILE layering.