CLPR-7.2: HieroTSS Verifier on Ethereum

## Story CLPR-7.2: HieroTSS Verifier on Ethereum

**Parent Epic:** CLPR-7: Ethereum Verifier
**Repo:** TBD

### Objective

Implement a Solidity verifier on Ethereum that validates Hiero TSS signatures and SHA-384 Merkle paths.

### Acceptance Criteria

- **AC-1:** Parses Hiero proof bytes protobuf (block proof, Merkle paths, queue metadata, messages).
- **AC-2:** Verifies TSS aggregate signature over state root hash using tracked Hiero TSS public key.
- **AC-3:** TSS key rotation: tracks current key, accepts transitions proven by outgoing key.
- **AC-4:** SHA-384 Merkle path verification: recomputes root, compares against signed state root.
- **AC-5:** Returns verified `ClprQueueMetadata` and `ClprMessagePayload[]`.
- **AC-6:** Reverts on invalid signature, path mismatch, malformed proof.
- **AC-7:** Gas analysis with real proof vectors from CLPR-4.2.

### Dependencies

- CLPR-7.1
- CLPR-4.2 (generates proofs this validates)
- SHA-384 support in EVM (precompile or library)

### Risk

**High** — SHA-384 not natively efficient in EVM. TSS verification may need precompiles. Gas costs could be prohibitive; ZK-wrapped proofs may be needed as alternative.

No implementation files or tests are named, and the target repo is TBD. Start by reviewing the CLPR-7.1 dependency and CLPR-4.2 proof vectors, then assess Solidity/EVM support for TSS signatures and SHA-384. Done means the verifier satisfies AC-1 through AC-7, including malformed-proof reverts and gas analysis.

Written by the indexing model from the issue text.