fix: remove stale vsomeip interop stubs that were never fully landed

[vtz]

Summary

• Removes the BUILD_VSOMEIP_INTEROP CMake option and its add_subdirectory(vsomeip_interop) call — the vsomeip_interop/ directory was never committed, so enabling this option would break the build
• Removes the protocol_checker README pointer to the non-existent examples/vsomeip_interop/ directory
• Removes false "interoperability testing passed" and "AUTOSAR conformance validated" claims from test documentation — the project tests against the Open SOME/IP spec, not an AUTOSAR conformance suite
• Replaces inflated "AUTOSAR Compliance Levels" framing with honest "Open SOME/IP Specification Coverage"

These were leftovers from an earlier interop effort that was abandoned but not properly reverted, combined with aspirational doc claims that were never backed by actual testing.

Closes #233

Test plan

• Verify cmake -DBUILD_VSOMEIP_INTEROP=ON is no longer accepted (option removed)
• Verify cmake .. && make still builds cleanly
• Grep for vsomeip_interop and BUILD_VSOMEIP_INTEROP in tracked files — should return zero matches

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: b96830bd-a328-4a60-80c5-30cade3c8ba2

📥 Commits

Reviewing files that changed from the base of the PR and between a5c83f7 and 30a1d67.

📒 Files selected for processing (5)

• CMakeLists.txt
• examples/CMakeLists.txt
• examples/protocol_checker/README.md
• tests/100_PERCENT_COVERAGE_ANALYSIS.md
• tests/COMPREHENSIVE_TESTING_GUIDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/remove-vsomeip-interop-stubs

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