compute_hash (savings_ledger/event.rs)

Defines savings event structure and related enums for a tamper‑evident savings ledger.

// Source: https://github.com/yvgude/lean-ctx | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
//! The auditable per-event savings record (the G1 counterfactual unit).
//!
//! One [`SavingsEvent`] is appended per value-producing read: it captures the
//! counterfactual (`baseline_tokens` = what the agent would have consumed) against the
//! `actual_tokens` actually sent, the resolved pricing model, and a SHA-256 hash chain
//! so the history is tamper-evident. See `docs/business/03-verified-savings-ledger.md`.

use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256};

/// Savings produced by making the payload smaller (tool output compression,
/// proxy wire compression). T

... (truncated -- full source via MCP)