StoreStress

Adversarial crash, contention, corpus-rebuild, WAL, and descriptor harness for the SQLite-backed CostUsageStore. It is a separate package so its internal test access never enters normal CodexBar builds.

Build the optimized harness from this directory:

swift build -c release -Xswiftc -enable-testing

Run swift run -c release -Xswiftc -enable-testing StoreStress -- without arguments to print the available subcommands. Every store/cache argument should point at a disposable temporary directory. rebuild and incremental accept an optional sessions root, which makes it possible to measure a read-only corpus snapshot without writing to the real Codex session or CodexBar cache directories.