paper v2.37.3: add paragraph headers to Appendix A

Appendix A (Reference Implementation) was the only main section
without \paragraph{} headers. Added two:

  - Release scope (existing ¶1: what the release contains)
  - Repository organization (existing ¶2: how the code is structured)

Now every multi-paragraph section in the paper has explicit paragraph
headers for skim-readability. Other appendices either are single-paragraph
already (so don't need headers) or have explicit \paragraph{Pitfall N:}
structure (Appendix B).

Page count: 20 (unchanged).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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