Read BENCH_PLAN.md, the plan you two designed and fused, and implement it in this directory as bench.py, an astral uv single file script. Python standard library only, runnable with uv run bench.py. Definition of Done is defined by a gate YOU design. At minimum it proves uv run bench.py runs to completion, writes RESULTS.md with a markdown table holding a timed row AND a measured peak RAM figure for every strategy in the plan, and declares a Speed Winner and a Memory Winner from those measurements. Measured, not assumed. The fastest strategy has to beat the naive autocommit baseline by at least 5x. Baseline the gate RED before you build anything. Never shim, wrap, or modify global system tools.