Implementation:
- Add enqueue_task(PToken&, FuncType&&) overload so high-rate callers
can use a dedicated producer token without losing the future-based
return. Mirrors the no-token version: try-enqueue with fast-path
grow on pressure (autoscale pools), block-enqueue otherwise.
Tests (5 new, 87 total):
- tp_enqueue_task_with_ptoken: basic int/string/void futures via ptok
- tp_enqueue_task_ptoken_exception: exception forwarded through future
- tp_enqueue_task_ptoken_multiple_futures: 50 concurrent futures, all
resolved correctly
- tp_construct_scaling_nonpositive_decline_throws: decline_threshold ≤ 0
was the only ScalingConfig validation not covered by an explicit test
- tp_autoscale_fast_path_grow_on_pressure: verifies _maybe_grow_on_pressure
fires (thread_count grows synchronously) when enqueue_work_autoscale
finds the queue full
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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