[StuartFerguson]

Summary

• Replace Moq-based test doubles with Imposter across business logic, database, projection, and integration tests
• Add shared Imposter test usings and update test project dependencies
• Update package configuration to support the migration

Testing

• BusinessLogic focused migrated tests: 209 passed
• TransactionProcessor full suite: 114 passed, 1 skipped
• One unrelated BusinessLogic test remains environment-blocked writing to C:\Temp\statements\inbound

Closes #1903

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity

Metric	Results
Complexity	0

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[chatgpt-codex-connector]

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