[Adebayo120]

Summary

• Close the client's currently owned transport before replacing it in connect().
• Add a regression test that verifies reconnect closes the old transport and disconnect() closes the replacement.
• Document the reconnect cleanup behavior.

Reproduction

Connect one Client to a first transport, call connect() again with a second transport, then call disconnect(). Before this change, the first transport's close() is never called; only the second transport is closed, potentially leaving the old server process or HTTP session/stream active.

Validation

• php vendor/bin/phpunit tests/Unit/Client (803 tests)
• PHPStan on the changed client and unit test
• PHP-CS-Fixer dry run on changed PHP files