Enforce null compression in compression_methods list

[julek-wolfssl]

F-365

[Copilot]

Pull request overview

This PR enforces that a TLS ClientHello compression_methods list includes the mandatory null compression method, and adds a regression test to verify the server rejects ClientHello messages that omit it.

Changes:

• Add a new TLS 1.2 API test that injects a malformed ClientHello without null compression.
• Update internal handshake parsing to fail with COMPRESSION_ERROR (and send illegal_parameter when enabled) when null is missing.
• Register the new test in the TLS test suite declarations.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/api/test_tls.h	Adds prototype and registers the new TLS test in the macro list.
tests/api/test_tls.c	Introduces a memio-based TLS 1.2 regression test for missing null compression.
src/internal.c	Adds enforcement: reject ClientHello compression lists that omit null.

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