profile: guard plugins.txt sync against crash-time rewrites

Bethesda's engine rewrites Plugins.txt as part of its shutdown sequence.
On a clean exit it preserves the active set; on a crash it can serialize
a partially cleared set — every plugin name still listed, but most
without their leading '*'. The previous syncPluginsBack code copied that
file back to the profile faithfully, after which refreshESPList +
savePluginList re-derived state and persisted the broken active list.
NSPBR observed this as 1170 active plugins collapsing to 54.

Two independent guards:

- afterRun() now skips the post-launch sync when exitCode != 0. Non-zero
  is a strong "do not trust the prefix file" signal.
- syncPluginsBack() compares starred-line counts in candidate vs profile.
  Refuses the copy when the candidate would drop the active count by
  more than 30% relative AND more than 10 plugins absolute. Belt and
  suspenders for cases where the engine catches its own crash and
  exits 0 anyway.

Both guards apply regardless of the VFS bridge state and protect every
launch on every modlist.

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

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