[freshtonic]

Layer 6 of the CIP-5203 stack. Implements CIP-5308.

• New crate stack-kms-gcp: a Cloud KMS REST client (encrypt/decrypt) that supports both key modes. Data keys are generated locally, the AAD goes in additionalAuthenticatedData, and CRC32C is checked on every field.
• Credentials: a static token, a service account JWT (RS256: AWS-LC on native targets, the pure-Rust rsa crate on wasm32), and the metadata server (native only).
• Tests: hand-written fixtures, a JWT known-answer test against openssl, and the contract suite.
• The opt-in live workflow is integration-gcp-kms.yml. To turn it on, set the variable STACK_KMS_GCP_LIVE_KEY and the secret STACK_KMS_GCP_SERVICE_ACCOUNT_KEY.
• RUSTSEC-2023-0071 (rsa) no longer affects a native or Go guest build: native RS256 uses AWS-LC, and the guest builds without service-account. Only a wasm32 build with service-account uses rsa; a security reviewer must sign that off before such a build is released. See the orchestrator review in the decision log.

Replaces #1628, which was closed.

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[github-actions]

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

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