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Fixed POSIX compatibility issue in hooks/run-hook.cmd that caused
"Bad substitution" errors on Ubuntu/Debian systems where /bin/sh is dash.
Changes:
- Replaced bash-specific ${BASH_SOURCE[0]:-$0} with POSIX-compliant $0
- Tested with both bash and sh (POSIX mode) on macOS
- Updated version to 3.6.2 in all required files
Fixes #141