Implement a Write-Ahead Log (WAL) key-value store with crash recovery. The store must maintain a data file…

Implement a Write-Ahead Log (WAL) key-value store with crash recovery. The store must maintain a data file…: a task in termgrade-bandcentral-gemma4-31b-bash: TermGrade Band-Central: the 151-task selection and its splits (Harbor dataset). The store is a single executable script at /app/kvstore.py…

The task

The store is a single executable script at `/app/kvstore.py` that accepts commands via stdin, one per line, and writes responses to stdout. Commands are case-sensitive.

Part of ai-and/termgrade-bandcentral-gemma4-31b-bash.