Add anonymized real-user trace (Backyard AI evidence) + real_user viewer config

Add configs metadata so the dataset viewer renders both trace files

Document live-run trace fields

Real MiniCPM live ZeroGPU traces (all 4 cases, model_was_called=true)

[Codex] Remove stale build trace file

[Codex] Replace build log with app output traces

[Codex] Publish public build trace dataset

initial commit