[codex] Make Swoole worker recycling cooperative

[adhikjoshi]

Summary

This PR changes HTTP worker max-request recycling from Swoole's built-in max_request path to an application-level cooperative recycle check that runs only after a request coroutine has unregistered itself.

Root cause

Production evidence showed a worker recycle overlapping an in-flight /api/v6/image_editing/qwen_edit request. The worker logged graceful shutdown, but Nginx still saw recv() failed (104: Connection reset by peer) from the upstream and returned 502. In coroutine mode, Swoole's built-in HTTP worker recycling can close the worker while another coroutine response is still being read upstream.

What changed

• Forces HTTP max_request and max_request_grace to 0, even if low-level Swoole options try to re-enable them.
• Keeps task worker task_max_request and task_max_request_grace unchanged.
• Adds per-worker cooperative counters to WorkerState.
• Adds StopWorkerIfMaxRequestsExceeded, which requests worker stop only when the max-request threshold has been reached and Monitor::getActiveRequestCount() is 0.
• Wires the recycler in the request finally block after timer cleanup and request coroutine unregister.
• Classmaps bin/WorkerState.php so typed source classes and the new action can resolve it outside the Swoole entrypoint's manual require path.
• Adds unit coverage and a real Swoole HTTP server integration probe for serial, overlapping, and batched concurrent recycle cases.

Validation

• /opt/homebrew/Cellar/[email protected]/8.3.29/bin/php vendor/bin/phpunit
129 tests, 974 assertions passed. PHPUnit reports 11 existing deprecations.
• /opt/homebrew/Cellar/[email protected]/8.3.29/bin/php vendor/bin/phpunit tests/Feature/SwooleCooperativeRecycleIntegrationTest.php
3 tests, 107 assertions passed.
• Repeated the real Swoole integration probe 5 consecutive times; all passed.
• /opt/homebrew/Cellar/[email protected]/8.3.29/bin/php vendor/bin/phpstan analyse src/Swoole/Actions/StopWorkerIfMaxRequestsExceeded.php --level=8 --memory-limit=1G --no-progress passed.
• /opt/homebrew/Cellar/[email protected]/8.3.29/bin/php /opt/homebrew/bin/composer validate --strict passed.
• php vendor/bin/phpunit tests/Unit/StopWorkerIfMaxRequestsExceededTest.php with the default non-Swoole PHP binary passed.
• Confirmed no leaked local Swoole probe processes after tests.

Notes for review

A broader PHPStan run over touched existing command/handler files still reports pre-existing baseline issues unrelated to this PR, including HigherOrderTapProxy::start(), OnWorkerStart::bootWorker() missing a static-analysis return, Redis::purge(), and narrowed function_exists() checks. The new action itself is clean at PHPStan level 8.