job.unsubscribe wire type and payload diverge (§7.6)

[nficano]

Category: spec-conformance Severity: major
Location: src/Messages/Subscriptions/Unsubscribe.php:10-29
Spec: ARCP v1.1 §7.6

What

Spec §7.6 defines wire type job.unsubscribe with {job_id} payload. SDK uses unsubscribe with empty payload and an envelope-level subscription_id.

Evidence

final readonly class Unsubscribe extends MessageType
{
    public static function typeName(): string
    {
        return 'unsubscribe';
    }

    public function toArray(): array
    {
        return [];
    }
}

Proposed fix

Rename typeName to 'job.unsubscribe' and accept job_id in the payload.

Acceptance criteria

• Unsubscribe envelopes carry type: "job.unsubscribe" and payload: {job_id: ...}.