bench-cgr29: billed-cost A/B run logs

Raw run logs for the CGR-29 billed-cost A/B (bench/billed-cost, PR #190): 405 runs (stream transcripts, result.json, patches). Not a binary release.

sha256 4102ac4149f2f9b323d8be62b16609b5398fc17190b85187b41234375a697735

Reproduce the results/*.json: extract, then python bench/billed-cost/analyze.py --runs runs.