[matkomat-agent-2]

Summary

• add ServiceInterface::lastError() and service-level runtime error recording
• centralize micro runtime error handling through recordError()
• add focused integration coverage for handler failures, throwing error handlers, and automatic error-response send failures

Testing

• vendor/bin/phpunit tests/Integration/Micro/ServiceTest.php

Closes #73

[matkomat]

No findings.

Matches plan:

• ServiceInterface exposes lastError(): ?\Throwable
• Service stores and returns the latest runtime error through a single recordError() path
• handler exceptions update endpoint stats and lastError()
• automatic error-response send failures update lastError()
• a throwing configured errorHandler does not break the main runtime error path
• no unrelated lifecycle or API cleanup work was folded into this PR
• src/Message.php was not modified

Verification:

• vendor/bin/phpunit tests/Integration/Micro/ServiceTest.php
• vendor/bin/phpunit tests/Integration/Micro/ServiceExtendedTest.php tests/Integration/Micro/StatsHandlerTest.php