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Problem
Every test invocation connects to LocalStack and clears a shared bucket, including UUID-only runs. Concurrent worktrees can erase each other's state. Backend-independent tests and credential-free EKV integration cases are not separated from service-dependent fixtures.
Fix
Allocate a unique bucket per run without contacting storage. An opt-in LocalStack case template creates it only for selected modules; suite cleanup removes only that run's bucket. Remove unused per-test IAM buckets from the server and lifecycle fixtures.
Separate LocalStack, local EKV, and credentialed integration lanes. Add focused namespace and cross-bucket cleanup cases, and document the explicit LocalStack endpoint and lane selection.
Supporting information
The default suite now includes local EKV but excludes LocalStack. CI must explicitly include the LocalStack lane to retain S3 coverage; coordinate the command in #28 when merging. #32 separately repairs the existing shared-EKV teardown.
Stock LocalStack 4.14 rejects conditional DELETE with
If-Matchas unsupported. The existing physical-deletion scenarios still expose that backend limitation; this change does not bypass their conditions or relax production fencing.