feat(policy-engine): add integration test chaining all three primitiv…

[Peace-001]

…es (#233)

• Add CheckKind::Allowlist variant (with AllowlistCheck struct) to policy-engine, alongside the existing Denylist and Jurisdiction variants
• Fix CheckKind enum variants to use contracttype-compatible tuple struct form (#[contracttype] does not support named struct fields in enum variants)
• Add AllowlistCheckInterface + AllowlistCheckClient for cross-contract calls to allowlist-token.is_allowed()
• Add allowlist-token as a dev-dependency to policy-engine
• Add policy-engine and rwa-token to workspace Cargo.toml members
• Write contracts/policy-engine/src/integration_test.rs with 5 tests:
  • test_all_three_pass: all checks clear → evaluate returns true
  • test_fail_allowlist_check: from not allowlisted → false (AND semantics)
  • test_fail_denylist_check: from denylisted → false (AND semantics)
  • test_fail_jurisdiction_check: to in forbidden jurisdiction → false (AND)
  • test_or_semantics_any_check_passes: denylist fails but allowlist passes → true (OR)
• Fix pre-existing compile errors in denylist-gate, jurisdiction-flag, and allowlist-token source files (broken by conflicting PR merges on main)
• Update existing policy-engine/src/test.rs to use new CheckKind tuple syntax

All 9 tests pass (4 existing + 5 new integration tests).

Closes

Closes #

What changed and why

Checklist

• cargo test --workspace passes locally
• cargo clippy --workspace --all-targets -- -D warnings passes locally
• New functionality has test coverage for the happy path and at least one failure/auth case
  Closes Add an integration test: policy-engine chaining jurisdiction-flag, denylist-gate, and allowlist-token #233

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