# Phase 4 Steam execution evidence

- Date: 2026-07-20
- Requirement IDs: R-005, R-016, R-018, R-024
- Phase/gate: phase 4 / Steam execution
- Scope: typed native and Flatpak Steam launch plans, configuration provenance,
  argument-safe client submission, private logs, structured errors, and representative
  native plus Proton execution
- Exclusions: direct executable launch, provider-client ownership, strong game-lifetime
  tracking, automatic Steam shutdown, and minimal-session behavior
- Host: Linux 7.1.4-arch1-1; NVIDIA GeForce RTX 5070 using the `nvidia` driver;
  Steam 1.0.0.87-1
- Commands: `kiln launch steam:105600 --dry-run --json`; `kiln launch steam:105600
  --json`; `kiln launch steam:12810 --dry-run --json`; `kiln launch steam:12810
  --json`; `make check`
- Expected result: Kiln emits a typed `steam -silent -applaunch <appid>` plan, submits
  it without shell interpolation, returns promptly with unknown lifecycle confidence,
  launches one native and one Proton title through Steam, and reports missing clients
  as structured failures
- Observed result: Terraria App ID 105600 loaded through Steam Linux Runtime and its
  native `Terraria.bin.x86_64`; Overlord II App ID 12810 loaded through
  `GE-Proton11-1` and `Overlord2.exe`; both returned cleanly after user exit
- Safety and cleanup: Steam was stopped before the temporary compatibility change and
  final restore. The original `config.vdf` was restored byte-for-byte with SHA-256
  `9251c6dbf08602857399916808208bd58dd415b5d5b000acc01f1c9044d89c37`, mode and
  ownership unchanged, and Steam restarted
- Automated result: 61 tests passed with the complete local gate
- Result: pass