chore: add versioned snapshot setup_v0.9.5.sh, reset VERSION to 0.9.5
Introduces the versioned-snapshot naming convention: each release creates a new setup_v<X.Y.Z>.sh file alongside the live setup.sh; old snapshots are never removed. Resets VERSION from 1.0.0 to 0.9.5. https://claude.ai/code/session_01Y4dMKtkqkpvmgDKoRdzhTG
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