add puzzle status error

[dolfolife]

Also, added basic test for the Puzzle object while getting unmarshall

[codecov-commenter]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (b94a293) 12.76% compared to head (bb49fc4) 17.73%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
pkg/puzzle/puzzle.go	53.84%	10 Missing and 2 partials ⚠️
pkg/puzzle/puzzle_errors.go	0.00%	7 Missing ⚠️
pkg/math/geometry.go	84.21%	2 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   12.76%   17.73%   +4.96%     
==========================================
  Files           9       10       +1     
  Lines         235      265      +30     
==========================================
+ Hits           30       47      +17     
- Misses        204      212       +8     
- Partials        1        6       +5     

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