Look up a platform user by email address. Returns the user's Keycloak ID and profile fields (name, LinkedIn ID). Use get_user_by_email to check if someone already exists or to resolve identity before updating a workspace member.

Use when: Use when you know the email and need to look up a user before adding or updating workspace membership. If email is unknown during an update, prefer search_workspace_members to find existing members (or search_users for platform-wide lookup), confirm identity with the user, then call create_workspace_member with the resolved email.

Behavior: read_only

Also returns pagination info (created_at, updated_at, created_by, updated_by, deleted_at, deleted_by).