[freshtonic]

Layer 5 of the CIP-5203 stack. Implements CIP-5310.

• New crate stack-kms-vault: a hand-written Transit client (encrypt, decrypt, rewrap).
• stack_kms_vendor::bound binds the AAD into the wrapped key itself. Vault ignores context on a key that is not derived, and Azure (CIP-5309) needs the same mechanism.
• Auth: token, AppRole, and Kubernetes (native only).
• Tests: recorded fixtures, the contract suite, and a vault server -dev CI job.
• The crate is staged in the stack-kms-vendor release group.

Decisions are in docs/plans/2026-11-05-key-vendor-backends-decisions.md (CIP-5310 sections).

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[github-actions]

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

cargo-mutants did not complete (exit ) before producing results. Check the workflow run logs. The gate below will fail.