Project-Kiln/docs/phase-4/evidence-2026-07-20.md

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