Add file-expenses skill

[yazeedr6]

Summary

• add a reusable skill for preparing employee expense reports from receipts
• validate required fields, duplicates, currencies, and policy warnings
• require explicit user confirmation before final submission or attestation

Validation

• python3 skills/.system/skill-creator/scripts/quick_validate.py skills/.curated/file-expenses
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Make receipt fields conditional for mileage expenses

When this skill is triggered for mileage reimbursement, the workflow requires a receipt path/URL for every expense and later instructs the agent to attach the corresponding receipt. Mileage claims commonly have no merchant receipt and instead require distance, route, vehicle, and reimbursement-rate details, none of which the manifest captures. This causes the agent either to block on a nonexistent receipt or prepare an incomplete mileage claim despite mileage being explicitly listed as a supported use case; make receipt/merchant fields conditional and add the mileage-specific fields.

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