List the workspaces the signed-in person can reach
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List the workspaces the signed-in person can reach
Returns every workspace the caller’s verified email can sign into
(policy-passing - the same signin_decision gate as sign-in), with the
active (current-session) one flagged. This is the read-only foundation of
the cross-tenant workspace switcher (P1); re-scoping the session to another
workspace (the active-tenant signed claim) is P2. When the session identity
carries no email, only the current workspace is returned.