Codspeed Optimize

This is an autonomous performance optimization loop that uses CodSpeed benchmarks and flamegraph analysis to make code faster without you babysitting it. It runs benchmarks, digs into flamegraphs to find bottlenecks by self-time, applies targeted fixes one at a time, re-measures, and keeps going until the gains dry up. It's strict about methodology: always measure through CodSpeed, never change multiple things at once, validate improvements in walltime mode before calling it done. The workflow is solid if you already have benchmarks set up, but it won't optimize blindly. If you don't have a harness yet, it stops and tells you to set one up first, which is the right call.