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C0: add sn2-prelaunch wrapper to clear SN2 stale lockfiles

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UE5 writes Saved/running.dat as a "session in progress" marker. If
the previous session exited uncleanly (SIGKILL, crash), it lingers,
and SN2 pops up an invisible 0×0 Error dialog at next launch that
the GameThread blocks on forever — visible only as a black screen
with a spinning loader. Wrap the Steam command to clear the marker
files before each launch.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erich Blume 2026-05-15 12:11:54 -07:00
commit 96dbbb3cbe
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docs/changelog.d/+ringtail-sn2-prelaunch.infra.md Normal file
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Add `sn2-prelaunch` Steam launch wrapper on ringtail that removes
Subnautica 2's stale `Saved/running.dat` and `Saved/beforelobby.dat`
lockfiles before each launch. SN2 pops up an invisible (0×0-sized)
Error dialog when it detects an unclean exit, blocking GameThread
forever; this is observable only as a black screen with a spinning
loader. Use via Steam launch option: `sn2-prelaunch %command%`.