Auto-detect WSL2 environment with Windows filesystem paths (/mnt/c/, etc.)
and fall back to DELETE journal mode instead of WAL. SQLite WAL mode
does not work reliably across the WSL2/Windows 9P filesystem boundary
due to shared-memory limitations.
Detection checks:
1. Path matches /mnt/[a-z]/ pattern (Windows drive mount)
2. /proc/version contains microsoft or wsl
Fixes#920
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Executed-By: beads/crew/dave
Rig: beads
Role: crew
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