v1.2.0

Added

• Added lib/bash/gh/lib_gh.sh with generic GitHub CLI availability, authentication diagnostics, failure reporting, and checked command execution helpers.

Fixed

• Hardened std_run --timeout retry internals so timeout discovery is cached per call, fallback setup failures return a generic error, and fallback timer cleanup cannot remove the timeout marker before it is observed.
• Clarified update_file_section logging when appending a new managed section.

Removed

• Removed early compatibility aliases run, std_run_with_timeout, and str_in_array; use std_run, std_run --timeout, and list_contains instead.