Build invoice payment compliance audit exporter

[Kingsman-99]

Label: complexity: high
Points: 200

Description

src/compliance.ts's ComplianceReport type exists but there's no exporter producing a regulator/auditor-friendly export (e.g. CSV with required fields) across a date range.

Technical Context

New src/complianceExporter.ts. Filters and formats Invoice/Payment history into a ComplianceReport-shaped CSV/JSON export for a given date range and optional creator/payer filter.

Acceptance Criteria

• exportComplianceReport(invoices, { from, to, creator? }) returns a CSV string and the typed ComplianceReport[]
• CSV columns documented and stable (won't silently reorder on future changes — covered by a snapshot-style test)
• Date filtering is inclusive of both boundaries
• Tests: range filtering correctness; CSV column stability; creator filter narrows results correctly

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[Glam26]

I'd be happy to take this on.

I've worked on similar issues across multiple open-source and production projects, including feature development, refactoring, testing, documentation, performance improvements, and bug fixes. My approach is to first understand the existing architecture and conventions, then deliver a solution that is clean, maintainable, and aligned with the project's standards.

I'll make sure the implementation is thoroughly tested, well-documented where necessary, and covers relevant edge cases. I'm comfortable collaborating during review, incorporating feedback quickly, and ensuring the final result is production-ready.

[Glam26]

I'd be happy to take this on.

I've worked on similar issues across multiple open-source and production projects, including feature development, refactoring, testing, documentation, performance improvements, and bug fixes. My approach is to first understand the existing architecture and conventions, then deliver a solution that is clean, maintainable, and aligned with the project's standards.

I'll make sure the implementation is thoroughly tested, well-documented where necessary, and covers relevant edge cases. I'm comfortable collaborating during review, incorporating feedback quickly, and ensuring the final result is production-ready.