docs: TypeScript SDK v1.16.0 release notes

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Documents the user-facing changes shipped in TypeScript SDK v1.16.0.

Changes in this release:

1. Auto-retry for ingress calls — The ingress client (@restatedev/restate-sdk-clients) can now retry ambiguous failures (network errors, HTTP 429, HTTP 5xx) automatically with exponential backoff. Retries are opt-in and gated on an idempotency key. Pass retry: true for defaults or an object to tune the policy with shouldRetry, maxAttempts, initialInterval, maxInterval, and exponentiationFactor.

2. Scoped virtual-object clients — ctx.scope(...) and ingress.scope(...) now expose objectClient / objectSendClient for virtual objects (requires RESTATE_EXPERIMENTAL_ENABLE_SCOPED_VIRTUAL_OBJECTS=true).

3. Aligned retry-policy terminology — exponentiationFactor added to the run retry policy in @restatedev/restate-sdk-gen; intervalFactor deprecated but still honored.

4. @restatedev/restate-sdk-tunnel reconnect policy renamed — flat reconnectInitialMs/reconnectMaxMs/reconnectFactor replaced by reconnectRetryPolicy with initialInterval/maxInterval accepting Duration or ms.

Files changed:

• docs/changelog/typescript-sdk.mdx — added v1.16.0 entry
• docs/services/invocation/clients/typescript-sdk.mdx — new "Automatic retries for ingress calls" section
• docs/services/flow-control.mdx — new "From the TypeScript SDK" subsection covering ctx.scope() and ingress.scope() for services, virtual objects, and workflows

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