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.

Continuation stop reasons are explicit on evaluations instead of inferred from class names.
AgentState adds recordStep() and failWith() helpers, plus explicit execution hook interfaces for timing.

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

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