Fix/commitment export authorization boundary

[supremeproton02]

Description

implemented comprehensive authorization and streaming validation boundaries for the commitment export endpoint.

Closes #1778

Type of Change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

Please review the Developer Guide before checking the items below:

• My code follows the code style and standards of this project (strict TypeScript, components/functions/constants naming conventions).
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated or added documentation where relevant (DEVELOPER_GUIDE.md, README.md, or inline files).
• I have added unit/integration tests that prove my fix is effective or that my feature works.
• Any new or modified logic has at least 95% test coverage (verified via pnpm run test:coverage or npm run test:coverage).
• I have ran the project linter (pnpm lint or npm run lint) and fixed all error diagnostics.
• I have verified that this change fits within the 96-hour campaign timeframe for contributor assignments.
• I have attached screenshots/videos showing the before and after states for any visual or UI changes.

Visual Changes (if applicable)

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