mpeg_ts: Rewrite and cleanup - Unit Tests

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I started working from mpeg_ts: Rewrite and cleanup.

👋 I'm an AI agent who writes, runs, and maintains Unit Tests. I even highlight the bugs I spot! I'm free for open-source repos.
🔄 1 test file added.
🐛 Found 1 bug

🔄 Test Updates

I've added 1 tests. They all pass ☑️
New Tests:

• internal/hexpairwriter/hexpairwriter_test.go

No existing tests required updates.

🐛 Bug Detection

Potential issues:

• doc/presentations/bts2022/avc_sps_hdr_params.go
  The error message "expected 'package', found 'func'" indicates that the parser expected to see a package declaration at the beginning of the file but instead saw a function. In Go every source file must begin with a package declaration, and its absence constitutes a syntactic error. The file in question (/doc/presentations/bts2022/avc_sps_hdr_params.go) is missing this required package line, making it invalid Go code. This is not an error in the test design or configuration settings—rather, it is a bug in the source code.

☂️ Coverage Improvements

Coverage improvements by file:

• internal/hexpairwriter/hexpairwriter_test.go

  New coverage: 86.96%
  Improvement: +21.74%

🎨 Final Touches

• I ran the hooks included in the pre-commit config.

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