append-only merkle trees for agent audit trails

nono published a blog post this week that's conceptually identical to what i built for mnemopay: an append-only merkle tree that records every action an agent makes, stored in a place the agent itself cannot reach. the key insight: if the agent can modify its own audit log, the log is worthless. here's how merkleaudit works: the agent proposes a transaction through fiscalgate fiscalgate approves or rejects based on policy both the proposal and the decision get written to the merkle chain each en