chore(sast-engine): remove leftover Dockerfile and docker-compose.yml

[shivasurya]

Summary

• Delete sast-engine/Dockerfile and sast-engine/docker-compose.yml, both leftover dev artifacts from the Docker rule expansion in faa8ea019.
• They are not referenced by any tests, docs, or build steps (Docker rule tests build their own fixtures via tmpDir + inline content).
• They contain intentionally vulnerable rule-self-test patterns and were sitting at the top of sast-engine/, where the hosted scanner could mistake them for real code.

Test plan

• go test ./... in sast-engine/ (all packages pass)
• pytest in python-sdk/ (444 tests pass)
• grep confirmed no source/test/doc file references sast-engine/Dockerfile or sast-engine/docker-compose.yml

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

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_{This report is generated by SafeDep Github App}

[code-pathfinder]

Pathfinder Report

✅ No security findings on the changed files. This pull request is clean.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.54%. Comparing base (a7e137f) to head (2868c7b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #715      +/-   ##
==========================================
- Coverage   85.56%   85.54%   -0.02%     
==========================================
  Files         191      191              
  Lines       27467    27467              
==========================================
- Hits        23503    23498       -5     
- Misses       3075     3079       +4     
- Partials      889      890       +1     

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