Prerequisite for the SSO Manager plugin system (shipped in sso-manager-node
v1.17.0). Adds secret/data/plugins/* (CRUD+list) + secret/metadata/plugins/*
(list/read/delete) to the sso-broker policy HCL so the SSO can store per-instance
plugin secrets in OpenBao instead of sso-secrets.js. ensure_policy is idempotent,
so re-running ./setup.sh grants the existing SSO_VAULT_TOKEN live.
Docs: secrets.md (Plugin secrets section + policy row), architecture.md.
Co-Authored-By: Claude <noreply@anthropic.com>
wmantly
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