[cristim]

Summary

• The MemoryDB purchase path now calls the shared purchaseguard.Guard and purchaseguard.Recover instead of its own copy of the issue #641 guard, mirroring ElastiCache (refactor(aws): share the purchase idempotency guard, starting with ElastiCache #507, providers/aws/services/elasticache/client.go idempotencyGuard and recoverAlreadyExists).
• The guard still runs before the purchase call. Valid purchases behave as before.
• New purchase_guard_test.go covers each guard rule at this path with bounded mocks.

Verification

• providers/aws build, vet, go test -timeout 300s -count=1 ./..., golangci-lint (0 issues) and the git-secrets script, with and without GOWORK=off.
• Mutation probes (reverted): skipping the guard fails the short-circuit, lookup-order, lookup-error and no-recovery tests; skipping Recover fails the AlreadyExists recovery test.
• The new tests are characterization tests of an existing behavior, so they pass before and after this refactor; the probes show they fail when the guard is removed.
• None of the files touched here are touched by fix(ladder): stop subtracting existing commitment from residual baselines #441, fix(gcp): fail closed on region-less storage SKUs and ambiguous SKU matches #471, fix(azure): count savings plans billed to another subscription in the duplicate check #491 or fix(azure/compute): skip scope checks on terminal VM reservations #439.

Part of #10

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📒 Files selected for processing: 3

• CHANGELOG.md
• providers/aws/services/memorydb/client.go
• providers/aws/services/memorydb/purchase_guard_test.go

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[cristim]

Closing: accidental duplicate of #594 (two push runs raced).