Symlink saves, rank prefixes by Steam app type, ntsync safeguards

- Replace copy-in/copy-out save deployment with a direct symlink from the
  prefix's __MO_Saves to the profile's saves/. Writes land in the profile
  immediately; afterRun reverts the symlink + prefix INI so a vanilla
  launch outside MO2 uses the default Saves dir.
- Parse Steam's binary appinfo.vdf (v41) via a new Rust FFI crate backed
  by steam-vdf-parser. Rank detected games by common.type so real Games
  beat Tools/Editors when multiple prefixes share a My Games folder name
  (fixes Creation Kit shadowing Skyrim SE). Top-ranked candidate
  overwrites stale symlinks from earlier runs.
- Switch bundled Steam Linux Runtime downloader from sniper (steamrt3)
  to steamrt4 so Proton 11+ works out of the box. steamrt4 omits xrandr
  so we inject it from the Debian x11-xserver-utils .deb into a
  dedicated dir and prepend it to PATH via `env PATH=...` inside the
  pressure-vessel container (PATH env doesn't propagate).
- Auto-kill stale wineboot/wineserver/pv-adverb processes still bound
  to the prefix before starting a new wineboot -u; match by
  /proc/<pid>/environ WINEPREFIX / STEAM_COMPAT_DATA_PATH since Wine
  cmdlines are Windows-style. Same sweep runs in destroyPrefix so a
  delete actually frees file handles.
- Blacklist Proton 11 (Steam-bundled) — its current Wine tree deadlocks
  during wineboot -u on modern kernels via ntsync / futex_wait_multiple
  races. Use "waitforexitandrun" (not "run") for prefix init so
  use_sessions=1 Protons don't fork into a persistent session manager.
- Drop WINEDEBUG=-all during prefix init so wineboot progress is
  visible. Suppress focus-stealing by setting WA_ShowWithoutActivating
  on the PrefixSetupDialog and SLR download progress dialogs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/libs/steam_appinfo_ffi/include/steam_appinfo_ffi.h b/libs/steam_appinfo_ffi/include/steam_appinfo_ffi.h
new file mode 100644
index 0000000..be53999
--- /dev/null
+++ b/libs/steam_appinfo_ffi/include/steam_appinfo_ffi.h
@@ -0,0 +1,24 @@
+#ifndef MO2_STEAM_APPINFO_FFI_H
+#define MO2_STEAM_APPINFO_FFI_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/// Callback invoked once per app in appinfo.vdf. Strings are valid for the
+/// duration of the call only — copy if you want to keep them.
+typedef void (*SteamAppInfoCallback)(void* user, uint32_t appid,
+                                     const char* type, const char* name);
+
+/// Parse Steam's appinfo.vdf at `path` and invoke `cb` for every app.
+/// Returns 0 on success, negative on error.
+int32_t steam_appinfo_parse(const char* path, void* user,
+                            SteamAppInfoCallback cb);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // MO2_STEAM_APPINFO_FFI_H