* fix(test): establish a writable previous-release upgrade baseline
* fix(ci): reserve capacity for durable admin fixtures
* fix(ci): group durable IAM state fixtures by resource needs
* ci: run E2E doctests with the E2E dependency graph
* fix(ci): separate fixture startup from transport deadlines
* fix(ci): bound pagination after seeding and revisit restored copies
* fix(ci): make filesystem fixture timing deterministic
* fix(ecstore): avoid metadata lock reentry during internal mutations
* test: align recovery fixtures with durable ownership contracts