Fix flaky 404 and 406 preparators

[sidux]

Summary

• reuse valid operation examples for 404 and 406 cases
• use a stable unsupported media type instead of random MIME types
• select missing-resource parameters by URI order
• generate a different schema-valid missing path value, or skip unsafe cases
• preserve deep-object query parameters and request bodies

Tests

• composer check-cs
• composer check-static
• composer test (119 tests, 284 assertions)
• focused SdZv4 404 integration test

[github-actions]

Issued by Coverage Checker:

Coverage

✅ Your code coverage has not been degraded 🎉

Measure	Main branch	refs/pull/90/merge
Coverage	57.966%	59.307%
Total lines	3402	3551
Covered lines	1972	2106

∆ 1.341

🟢 ↗️ Improved files:

File	On main branch	refs/pull/90/merge
APITester/APITester/src/Schema/Entity/Example/OperationExample.php	250 / 296 (84.459%)	254 / 296 (85.811%)

🔴 ↘️ Degraded files:

File	On main branch	refs/pull/90/merge
APITester/APITester/src/Test/Preparator/Error404Preparator.php	29 / 29 (100%)	160 / 179 (89.385%)

[Copilot]

Pull request overview

Makes 404 and 406 test generation deterministic while preserving valid operation examples.

Changes:

• Reuses operation examples and preserves request data.
• Generates stable missing-resource values and unsupported media types.
• Adds regression tests and configuration documentation.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/Test/Preparator/Error404Preparator.php	Generates stable 404 path values.
src/Test/Preparator/Error406Preparator.php	Reuses examples with deterministic media types.
src/Test/Preparator/Config/Error406PreparatorConfig.php	Changes default media type and case count.
tests/Preparator/Error404PreparatorTest.php	Tests preserved data and stable paths.
tests/Preparator/Error406PreparatorTest.php	Tests example reuse and deterministic selection.
docs/preparators-config.md	Documents updated preparator behavior.

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