[freshtonic]

Layer 8 of the CIP-5203 stack. Implements CIP-5311 (ADR-0014).

• The encrypt guest links stack-kms-vendor and the four vendor crates. A vendor request is a step of the step loop: the guest pauses with the signed request, and the host performs it, as it does for ZeroKMS. A credential is a step too. The host supplies short-lived credentials only: AWS temporary credentials, or an OAuth or Vault token. There is no RSA in the guest; the GCP service-account login is behind a default feature.
• Go API: WithKeyVendor, WithKeysetRecords, WithDefaultKeyset, WithRootKeyTTL, ErrNoZeroKMS. The vendor types are AWSKMS, GoogleCloudKMS, AzureKeyVault, VaultTransit and StaticKey. Credential seams are added; no vendor SDK is added to go.mod.
• A vendor-only client needs no CipherStash credentials.
• One guest with all backends.
• Tests: hermetic Go tests with the static key, and with AWS through a fake RoundTripper that checks SigV4 and call counts.

Decisions are in docs/plans/2026-11-05-key-vendor-backends-decisions.md (CIP-5311 section).

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[github-actions]

Mutation testing (cargo-mutants, --in-diff, stack-auth + stack-encrypt)

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