- scripts/rollback_generation.py: canonical rollback_generation() on the deploy_promotion machinery (shared lock, refuse-before-mutation, ancestor-only eligibility, identity+health qualification, durable history, revert on failed health). Live B->A->B proven with refusals. - tool_executor._resolve_execution_cwd: automatic project execution context (workdir > project registry resolve_cwd > process); unknown projects refused pre-execution. Live A-F proven. - construction_interface.close(): auto material_change + revision + drift/revise flow (rule 19Q.2 integrated, proven live). - spine: entry-point seeding (__main__ is a runtime path invisible to the import graph); subsystem belongs_to membership via coverage audit. - scripts/structural_coverage_audit.py: 237 modules A157/B41/C28/D11/E0, 100% meaningful coverage, 100% impl ownership, 0 significant unknowns. - Scaffolding internal 1.0.2 -> 1.0.3 (PATCH, contract unchanged). - Gate object T21.4 persisted (12 mandatory gates, GateAccounting).
