Reevaluate Immunefi Report 76865 for Bounty Reassessment

Immunefi report #76865 requests Sky re-review of two security issues: storage collision via delegatecall and payload slicing in cross-chain messages. Report cites PR #181 (ERC-7201 namespaced storage) and PR #199 (ABI decoding) as mitigations. Timeline: report May 7, PRs merged May 12/20. Sky asked to compare fixes against disclosed vulnerabilities and reassess bounty eligibility.