Docs update: SD AI Agent v1.21.0

[superdav42]

Release

SD AI Agent v1.21.0 — released 2026-07-30

Required doc updates

• docs/user-guide/ — document SD account billing and credit activity, including where administrators review account status.
• docs/user-guide/ — document site-scoped commerce plans and the customer-support agent profile workflow.
• docs/developer/ — document durable site-operation plans and active-job failure diagnostics if these surfaces are supported for integrators.

Changelog entry

= 1.21.0 - Released on 2026-07-30 =
* New: Create site-scoped commerce plans and manage SD account billing and credit activity from WordPress.
* New: Use customer-support agent profiles, durable site-operation plans, and active-job diagnostics for safer guided work.
* Improved: Chat recovery, checkpoint handling, image generation, onboarding verification, and WooCommerce activation safety.

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