JS implementation

1. **Canonical JSON + hashing** * stable stringify (sorted keys) * SHA-256 hash

2. **Wallet signing** * generate keypair / use passkey * sign tx

3. **Static publishing** * write tx file + update heads.json

4. **Clearing agent script** * crawl tx directories * validate signatures + per-signer chain * build Merkle root + batch manifest

5. **Governance co-sign** * N-of-M signatures on batch

6. **Anchor** * submit batch root to chain contract