feat(compliance): add revoke_allow entrypoint for soft de-listing

[Phantomcall]

PR: feat(compliance): add revoke_allow entrypoint for soft de-listing

Summary

Adds revoke_allow(env, admin, address) — a new entrypoint that removes the Allowed flag and any AllowedUntil expiry from an address without setting the Blocked flag. This enables operators to de-list an address from the allowlist without placing it on the blocklist.

Motivation

Previously, the only way to remove an address from the allowlist was:

• block_address — sets Blocked = true, marking the address as malicious
• clear_address — sets Blocked = false, Allowed = true, which re-allows

Neither provides a clean "remove from allowlist but don't accuse" path. revoke_allow fills this gap for addresses that are no longer active but not suspected of wrongdoing.

Implementation

• contracts/compliance/src/lib.rs: New revoke_allow function in ComplianceContract:
  • Authenticates the admin via require_admin
  • Checks the contract is not paused via require_not_paused
  • Removes DataKey::Allowed and DataKey::AllowedUntil from persistent storage
  • Tracks the address (so export_snapshot captures the state transition)
  • Emits an address_revoked event

Tests added

All in contracts/compliance/tests/compliance_test.rs:

Test	Description
revoke_allow_removes_allowed_status	Allow → revoke → is_allowed returns false
revoke_allow_does_not_block	After revoke, re-allow succeeds (blocked flag was not set)
revoke_allow_removes_expiry	Temp allow → revoke → is_allowed returns false, can re-allow
revoke_allow_returns_unauthorized_for_non_admin	Non-admin gets ContractError::Unauthorized
revoke_allow_returns_contract_paused_when_paused	When paused, returns ContractError::ContractPaused

Verification

All 40 tests pass: cargo test --package comebackhere-compliance

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Closes #76

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