feat: clean up new urn:said work and existing API surface area

[kentbull]

Preps the 1.0.0 release by removing unneeded API surface area and cleaning up the urn:said work.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.55%. Comparing base (5bbfbf7) to head (4732c3a).
⚠️ Report is 4 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   81.45%   82.55%   +1.10%     
==========================================
  Files           8        7       -1     
  Lines         496      344     -152     
  Branches       80       45      -35     
==========================================
- Hits          404      284     -120     
+ Misses         92       60      -32     

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