feat: migrate tests to Testo, require PHP 8.2

[roxblnfk]

🔍 What was changed

• Minimum PHP is now 8.2 ("php": ">=8.2").
• Tests run on Testo instead of PHPUnit: phpunit/phpunit and phpunit.xml are gone, testo.php declares a single Unit suite over tests/Goridge, composer test / composer test-cover call testo. No mocking library was needed — the suite has no mocks.
• CI calls spiral/gh-actions/.github/workflows/testo.yml@master (feat(testo): test PHP 8.2-8.6 by default, add test-server input spiral/gh-actions#10) with test-server: true and dependencies: ["lowest","highest"], so the PHP matrix is the workflow default 8.2–8.6.
• vimeo/psalm is widened to ^6 || ^7. Infection is removed from require-dev: the Testo adapter needs Infection 0.33+, which requires PHP 8.3; infection.json.dist now targets Testo, so the Infection Phar (it bundles the adapter) keeps composer test-mutations working.

Review notes

• A throwing #[AfterTest] hook in Testo does not fail the test (it only goes to stderr). The MultiRPC relay-leak check from tearDown() therefore runs through a small AfterEachTest interceptor in tests/Goridge/Support, which fails the test like PHPUnit did.
• Method attributes are inherited by overriding methods: #[ExpectException] on a base MultiRPC test also applies to the MsgPackMultiRPCTest override. The overridden base tests keep Expect::exception() in the body.
• testHandleRelayDisconnectWithPressureForceUndiscovered called expectException() twice; PHPUnit keeps only the last one, Testo checks both. The dead first expectation was dropped.

Checklist

• How was this tested:
  • Tests run locally against the Go test server (Docker): 183 tests under PHPUnit before, 183 under Testo after, same methods and data sets (JUnit comparison), highest and lowest dependencies
  • MessagePack tests checked locally only with a temporary local fix to MsgpackCodec (without ext-msgpack the rybakit/msgpack fallback always throws — a missing return); the fix is not part of this PR
  • CI on the new workflow: PHP 8.2–8.6, lowest and highest dependencies

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⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 36a263c8-4027-493e-8185-e8829df76ea5

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📥 Commits

Reviewing files that changed from the base of the PR and between f8080fa and 39727ef.

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📒 Files selected for processing (18)

• .gitattributes
• .github/workflows/phpunit.yml
• .github/workflows/testo.yml
• composer.json
• infection.json.dist
• phpunit.xml
• testo.php
• tests/Goridge/FrameTest.php
• tests/Goridge/MsgPackMultiRPCTest.php
• tests/Goridge/MsgPackRPCTest.php
• tests/Goridge/MultiRPC.php
• tests/Goridge/MultiRelayHelperTest.php
• tests/Goridge/RPC.php
• tests/Goridge/SocketFactoryTest.php
• tests/Goridge/StaticFactoryTest.php
• tests/Goridge/StreamTest.php
• tests/Goridge/Support/AfterEachTest.php
• tests/Goridge/Support/AfterEachTestInterceptor.php

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