saver-audit replays lean-ctx on users' own logs: method check?

[VladUZH]

Hi! I built saver-audit (npx saver-audit, MIT, fully offline). It reads a developer's local Claude Code and Codex logs, shows where their tokens went (priced with prompt-cache costs), and replays recorded tool outputs through token savers using the user's own installed copy.

For lean-ctx (3.10.3) it runs lean-ctx compress diff - --shell "<cmd>" --json for shell output and compress diff - --json for file reads, on each output of 500+ tokens, with HOME in a temporary folder. It takes your before/after counts and applies that ratio to its own token count of the same output. On my last 30 days: $125.57 of $4,209 (3.0%), labelled "replayed".

Manifest: https://github.com/VladUZH/saver-audit/blob/main/src/savers/builtin/lean-ctx.json

Two questions:

1. Is compress diff the right entry point for what the live hooks do?
2. Is there a flag that prints only the compressed text? Then the numbers would use one tokenizer throughout.

I'm sharing results publicly this week and will update them if you spot a problem.