1.2.0

feat: add subscriptionLimits field to Call interface

Add a new optional `subscriptionLimits` field to the `Call` interface
that exposes the organization's subscription limits at the time of the
call, including concurrency limit information.

Key changes:
- `Call.subscriptionLimits` added as an optional `SubscriptionLimits | undefined` field
- Field carries org-level subscription and concurrency limit data captured at call time

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