Pin H2 2.4.240 for upstream compaction data loss. A closed legacy fixture lost newly created audit tables after reopening with 2.3.232; replacing only the driver preserves them. Add cold-reopen durability coverage and document backup/runtime qualification. Full isolated verification passes 67 tests and all 204 dependency inventories agree. Co-authored-by: Codex (GPT-6) <noreply@openai.com> Signed-off-by: James Maes <james@kof22.com>