feat(issue-113): reconcile active test snapshots

[mxllv]

Summary

Reconciled the committed test_snapshots directory with the active compiled test suite so tracked snapshot artifacts now reflect currently running tests instead of a mix of stale and incomplete coverage.

Changes

• Removed stale snapshot files for ignored tests that are no longer part of the active compiled suite
• Added missing snapshot artifacts generated by active escrow and token tests
• Documented the snapshot maintenance policy in veritixpay/README.md
• Files affected: veritixpay/README.md, veritixpay/contract/token/test_snapshots/**

Validation

• cd veritixpay/contract/token && cargo +stable build
• cd veritixpay/contract/token && cargo +stable test
• Results: build passed; tests passed (19 passed, 16 ignored)

Mismatch Handling (if applicable)

• The repository’s committed snapshot set had drifted from the active compiled test suite, with stale files still tracked and active-test artifacts missing from version control
• Added only the smallest viable fix: remove stale snapshot files, commit the missing active snapshots, and document the expected maintenance rule
• The solution was kept minimal so the branch focused strictly on snapshot reconciliation without changing test logic

Notes

• This branch intentionally updates snapshot artifacts only for currently active, non-ignored tests
• Future test additions that emit snapshots should update contract/token/test_snapshots/ in the same change

Closes #113

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