whaiman/dev-ledger — reverse-engineered prompt

Build me a local privacy friendly VS Code activity tracker called DevLedger. I want it to quietly record my coding activity, like which files I focus, edits, saves, active time, and idle time, without sending anything online or needing an account.

Store the activity as an append only JSONL ledger on my machine. Each event should be linked to the previous one with a SHA 256 hash so I can later prove the log was not changed. Add a way to verify the full chain and warn if anything was edited or missing.

I also want a command line tool that can show stats, generate a readable Markdown report, create a simple SVG activity chart, inject the report into a README between markers, and reset tracking for a project. The report should include sessions, coding time, idle time, languages, integrity hash, and basic signals for unusual automated editing like huge pasted changes.

Use TypeScript and make it easy to build and install locally. Look up current VS Code extension docs online if you need to.