Terminating job.result never carries result_id after chunks emitted (§8.4)

[nficano]

Category: spec-conformance Severity: blocker
Location: src/Internal/Runtime/ToolInvocationHandler.php:197-211
Spec: ARCP v1.1 §8.4

What

§8.4: 'Once a result_chunk is emitted, the terminating job.result MUST carry result_id.' The runtime tracks chunk sequences per result_id but never inspects them at completion; JobCompleted/ToolResult carry only value. A chunked job always terminates with a non-conforming envelope.

Evidence

private function completeJob(Session $session, Envelope $env, Job $job, mixed $value): void
{
    $this->runtime->jobs->transition($job, JobState::Completed);
    $outcomeId = $this->runtime->emit($session, new ToolResult($value), [...]);
    $this->runtime->emit($session, new JobCompleted($value), [...]);
    $this->credentials->revoke($job);
    $this->rememberIdempotent($session, $env, (string) $outcomeId);
}

Proposed fix

Track on Job whether any chunks were emitted (and the most recent result_id). Extend JobCompleted (or introduce job.result) to carry optional result_id/result_size/summary.

Acceptance criteria

• After a tool calls emitResultChunk() at least once, the runtime's terminating envelope contains result_id referencing the streamed result.