Port beginning-of-book remark capability

[Enkidu93]

Fixes #173

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This change is 

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.93%. Comparing base (a6d5a1f) to head (ef65cf5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #194   +/-   ##
=======================================
  Coverage   88.92%   88.93%           
=======================================
  Files         282      282           
  Lines       17044    17056   +12     
=======================================
+ Hits        15157    15169   +12     
  Misses       1887     1887           

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[Enkidu93]

I went ahead and added a test. This code is tested elsewhere on the Serval/Machine side. Regardless, I can add the same test there if you'd prefer.

[ddaspit]

Reviewed 1 of 2 files at r1, 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Enkidu93)