[14.0][IMP] uom_rounding_coherence: block rounding changes that invalidate stock data

[eantones]

Summary

• Add stock quant coherence constraint: when changing a UoM rounding, checks that all existing stock quant quantities fit within the new rounding
• Prevents making rounding coarser than the data allows (e.g., changing from 0.001 to 0.01 when quants with 3 decimals exist)
• Add stock as dependency (was uom only)
• Bump version to 14.0.1.1.0

Test plan

• 13 tests pass (11 existing + 2 new)
• Pre-commit passes cleanly
• Verify on production: changing CO2 UoM rounding from 0.001 to 0.01 is blocked
• Verify on production: changing CO2 UoM rounding from 0.001 to 0.0001 is allowed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.63%. Comparing base (ce814c2) to head (0c2da09).
⚠️ Report is 4 commits behind head on 14.0.

Additional details and impacted files

@@            Coverage Diff             @@
##             14.0     #872      +/-   ##
==========================================
+ Coverage   50.53%   50.63%   +0.10%     
==========================================
  Files         979      979              
  Lines       16685    16724      +39     
  Branches     3558     3562       +4     
==========================================
+ Hits         8432     8469      +37     
- Misses       8034     8038       +4     
+ Partials      219      217       -2     

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