feat(escrow): SC-SEC-063 Implement re-entrancy unit tests and compact…

[shogun444]

Summary

Implemented SC-SEC-063 security validation improvements for compact revert handling and re-entrancy protection in the escrow contract.

Closes #417

Changes

• Added simulated re-entrancy attack coverage using a mock MaliciousToken contract

• Added test_reentrancy_guard_blocks_reentrant_calls

• Verified guarded execution aborts correctly on re-entrant behavior

• Added inline documentation for:

  • compact custom error code mappings
  • packed ContractConfig storage layout
  • reentrancy guard helpers and security flow

• Preserved existing packed storage and gas-aware contract structure

Validation

• Ran cargo fmt --all
• Passed cargo test --lib
• Verified re-entrant calls abort with expected Soroban host errors
• Confirmed escrow contract compiles successfully within current WASM structure

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