Drop the env-var key-set-diff WARN in check_p6_parity (environment-specific keys
like NODE_ENV/CVDIAG_*/SHOWCASE_BACKEND_HOST_PATTERN/BROWSER_POOL_* no longer
block a promote) and introduce a non-blocking ADVISORY disposition demoting
region/replicas/restartPolicy, missing-expected-prod-domains, and concurrency-key
divergence from WARN. check_critical_env_key_parity stays staging-gated
((CRITICAL_ENV_KEYS & staging_keys) - prod_keys): it flags a critical key staging
carries but prod is missing, and tolerates infra/operator tokens absent from both.
Adds red-green spec coverage in test_promote_p6.rb. No source symbols renamed/removed.
Bug #2: promote used serviceInstanceRedeploy, which replays the EXISTING
deployment and never pulls the newly-pinned digest, so prod could keep
serving stale. Switch to serviceInstanceDeployV2 to spawn a NEW deployment
that pulls the pinned digest, then verify_serving_digest! fail-loud asserts
the new deployment reaches SUCCESS and its meta.imageDigest == the pinned
digest. Update the promote mock-GraphQL fixtures across the spec suite to
return serviceInstanceDeployV2 + meta.imageDigest accordingly.
CLI accepts optional positional SERVICE + --digest REF (the showcase_promote.yml per-service
loop contract); validates against the SSOT; narrows the promotion target while fleet-scoped
preflight (service-set parity, expected prod domains) keeps reading full snapshots so a
healthy fleet isn't spuriously refused; adds red-green specs.
Jordan Ritter