Release Notes - v1.19.0

Highlights

Cleaned inference attempt lifecycle and event ownership in Polyglot.
Fixed serialization and caching edge cases across inference requests/partials.
Structured output handling is more robust with safer validation and immutable models.

InferenceExecution::withNewResponse() renamed to withSuccessfulAttempt().
InferenceExecution::withFailedResponse() renamed to withFailedAttempt().
InferenceExecution::withFailedFinalizedResponse() removed.
InferenceAttempt::withFailedResponse() removed; create attempts via startAttempt() / InferenceAttempt::started().
Usage::accumulate() removed; use withAccumulated() for immutable usage totals.
ValidationResult::invalid() now accepts ValidationError|ValidationError[] only.
ResponseModel::setPropertyValues() removed; use withPropertyValues().

InferenceRequest::toArray() now serializes messages and response_format as arrays.
InferenceRequest::hasMessages() and withCacheApplied() use explicit emptiness checks.
PartialInferenceResponse::toArray() now serializes response_data, with clearer tool accumulation.
InferenceStream no longer double-dispatches completion events.
HandlesRequestBuilder::withToolChoice() accepts string|array.

StructuredOutputStream reuses its generator and emits StructuredOutputStarted once.
Response validation captures thrown exceptions as ValidationResult::invalid().
Tool-call JSON encoding failures return Result errors instead of throwing.
ResponseModel::toArray() guards non-object instances; fluent methods return static.

Added coverage for attempt IDs, streaming completion events, serialization, validation failures, and ResponseModel immutability.

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