[ultima9]

Summary

Fixes #776.

Restores Steam's CEF compatibility-wrapper behavior for MetalSharp's x86_64/Rosetta 2 backend following the November 2026 Steam client update.

The current backend restores Steam's original steamwebhelper.exe before launch, removing the compatibility wrapper installed by Fix Steam. This results in repeated WineDbg crashes and a CEF initialization failure (target_services.cc(121)).

Changes

• Preserve Steam's CEF compatibility flags and DLL overrides on x86_64.
• Prevent restoration of the original Steam webhelpers on x86_64.
• Re-enable wrapper-readiness checks for x86_64.
• Keep FEX-specific behavior unchanged.

All changes are scoped to app/src-c/runtime/steam_actions.c.

Testing

Environment: Base M4 Mac mini (16 GB), macOS Tahoe 26.7.3, MetalSharp 1.1.0, x86_64/Rosetta 2.

• make -C app/src-c — passed.
• make -C app/src-c test — reported test suites passed; runtime-ready simulation skipped because bundle archives were unavailable.
• Started the compiled patched backend independently and verified it was the active backend process.
• Invoked POST /steam/launch using its Unix socket; received HTTP 200 OK.
• Confirmed Steam opened successfully and its signed-in Library interface rendered without the previous WineDbg crash loop.
• Confirmed the compatibility wrappers, original webhelper executables, and .ms_wrapper_deployed markers remained present in cef.win64, cef.win7, and cef.win7x64.

FEX behavior was not separately tested.

Scope

This PR specifically addresses the x86_64 backend. The FEX-side regression requires a separate fix, as discussed in #776.

[ultima9]

Additional testing confirmation: I created a separate MetalSharp 1.1.0 application bundle with the patched backend, re-signed it locally, and launched it normally through the macOS GUI.

Using the standard Start Steam button now successfully launches Steam, and the Steam Store renders correctly without the previous WineDbg crash loop.

This confirms the patch works not only through the backend's direct API endpoint but also through the normal MetalSharp GUI startup workflow on my M4 Mac mini (macOS Tahoe 26.7.3, x86_64/Rosetta 2).

[aaf2tbz]

Tysm!!