[2/2Refactor]: Spec-dec recipe lib: composable + per-model recipe

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.74%. Comparing base (555be6c) to head (1420299).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1412      +/-   ##
==========================================
- Coverage   76.74%   76.74%   -0.01%     
==========================================
  Files         476      476              
  Lines       51307    51298       -9     
==========================================
- Hits        39377    39369       -8     
+ Misses      11930    11929       -1     

Flag	Coverage Δ
unit	52.53% <100.00%> (-0.01%)	⬇️

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