Retire runtime/API/UI monitored-system volume enforcement now that infrastructure monitoring is no longer capped.
Keep only legacy metadata scrubbing and purchase-start compatibility for old max_monitored_systems references.
Rename the remaining preview surface to monitored-system impact and make previews explanatory rather than save-blocking.
Update subsystem contracts and RA7 evidence for the caps-retired invariant.
Derive OIDC and SAML browser-session principals from provider-scoped subjects instead of mutable username or email claims.
Preserve compatibility by migrating legacy username/email RBAC assignments to the stable SSO principal when no authoritative group mapping is present, and pin the invariant in API/security contracts.
Resolve hosted magic-link verification through current organization membership so sessions bind to the stored stable user principal instead of token email.
Add the v6 identity invariant contract and static guards covering hosted handoff, checkout, provisioning, and magic-link boundaries.
Use stable control-plane user IDs as hosted tenant organization principals while preserving email as contact metadata and legacy fallback. Cloud handoff sessions now bind to the signed subject instead of email, seeded tenant orgs store owner/member email separately from durable user IDs, and the subsystem contracts pin that boundary.
Treat OIDC, SAML, and multi-provider SSO as included Community capabilities while retaining advanced_sso as a compatibility key. Remove SAML-specific paywalls and paid-upgrade copy from runtime, settings UI, entitlement snapshots, docs, journey proof, and subsystem contracts.
Refs #1449
rcourtman