Real steam steamhost

[utkarshdalal]

Description

Recording

Type of Change

• Bug fix
• Performance / stability improvement
• Compatibility improvements
• Other (requires prior approval)

Checklist

• If I have access to #code-changes, I have discussed this change there and it has been green-lighted. If I do not have access, I have still provided clear context in this PR. If I skip both, I accept that this change may face delays in review, may not be reviewed at all, or may be closed.
• This change aligns with the current project scope (core functionality, stability, or performance). If not, it has been explicitly approved beforehand.
• I have attached a recording of the change.
• I have read and agree to the contribution guidelines in CONTRIBUTING.md.

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Summary by cubic

Real Steam mode now runs games against Valve's Windows client via a headless steam.exe host instead of steam.exe -applaunch; the session logs on with the app's refresh token and ends when the game exits.

New Features

• Real Steam mode now downloads steamhost-20260911-2.tzst with Valve's 2026-01-29 client tree and boots it through a headless host; stale client binaries are cleared each boot while steamapps, config, and userdata stay.
• The host receives the sealed refresh token, then launches the game with the executable, arguments, and working dir from the Steam launch config; the per-app Steam Input preference is written into localconfig.
• The overlay client falls back to localhost TCP for the real host, and the Steam invite overlay now works in Real Steam mode.
• A preloaded DNS shim returns IPv4-mapped IPv6 answers for Real Steam and three specific containers, since bionic's getaddrinfo rejects AI_V4MAPPED.
• The client package is now independent of EA.

Bug Fixes

• Pre-install steps re-run when the Wine prefix is recreated, tracked by a stamp inside .wine.
• VcRedistStep installs VC++ redistributables from any _CommonRedist/vcredist/<year> folder, not just the hardcoded list.
• The guest launcher now gets a copy of the launch env, so relaunches after pre-install steps keep it.
• The game pin loop stops as soon as the process is found, and the executable is matched as a path component so arguments after the exe name no longer read as not started.
• Client package downloads work before SteamService starts, fixing cold-launch asset fetches.

^{Written for commit 2554b56. Summary will update on new commits.}

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