fix: preserve sync audit history

[eshaffer321]

Summary

• add append-only processing attempts and order transaction audit tables
• prevent failed/pending retries from overwriting successful processing summaries
• log normal Monarch update/split mutations with order and transaction metadata
• reconcile already-split Costco/simple transactions before recording no-match failures

Verification

• go test ./...
• go build -o itemize ./cmd/itemize/

Notes

This addresses the Costco case where Monarch showed split transactions for an order while SQLite only retained a later failed no-match record.

[codecov]

Codecov Report

❌ Patch coverage is 66.09442% with 158 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.42%. Comparing base (8705650) to head (10500c2).

Files with missing lines	Patch %	Lines
internal/application/sync/recording.go	1.96%	50 Missing ⚠️
internal/infrastructure/storage/sqlite.go	81.78%	27 Missing and 20 partials ⚠️
internal/application/sync/types.go	47.16%	24 Missing and 4 partials ⚠️
internal/infrastructure/storage/mock.go	28.00%	17 Missing and 1 partial ⚠️
internal/application/sync/handlers/simple.go	83.78%	7 Missing and 5 partials ⚠️
internal/application/sync/orchestrator.go	40.00%	3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (66.09%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   59.87%   60.42%   +0.54%     
==========================================
  Files          46       46              
  Lines        5142     5582     +440     
==========================================
+ Hits         3079     3373     +294     
- Misses       1871     1987     +116     
- Partials      192      222      +30     

Flag	Coverage Δ
unittests	60.42% <66.09%> (+0.54%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/application/sync/handlers/amazon.go	65.28% <ø> (ø)
internal/infrastructure/storage/models.go	0.00% <ø> (ø)
internal/application/sync/orchestrator.go	34.65% <40.00%> (-0.05%)	⬇️
internal/application/sync/handlers/simple.go	78.03% <83.78%> (+4.29%)	⬆️
internal/infrastructure/storage/mock.go	53.57% <28.00%> (-1.89%)	⬇️
internal/application/sync/types.go	30.06% <47.16%> (+10.06%)	⬆️
internal/infrastructure/storage/sqlite.go	75.59% <81.78%> (+1.35%)	⬆️
internal/application/sync/recording.go	1.29% <1.96%> (-0.54%)	⬇️

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