
Updated OpenAPI specs to correctly document nullable fields across Scheduler, Events, Contacts, Availability, Free/Busy, and Attachments APIs.

New Signatures API lets you create, store, and manage reusable HTML email signatures per grant, and attach them automatically when sending messages or creating drafts.

Better scheduler auth error handling, date normalization fixes, and deferred booking ref initialization for private configurations.

Callback URI management, admin auth config fixes, and reduced code duplication across CLI commands.

CLI authentication, disposable email blocking, and authentication reliability improvements.

Hosted auth improvements including plus-sign support in emails, IMAP/SMTP validation logging, and performance optimizations.
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