v3.6.159

What's Changed

• GH#17669: auto-filter non-agentic models from headless round-robin by @marcusquinn in #17768
• t1919: fix: resolve_api_key subshell export bug in model-availability-helper.sh by @marcusquinn in #17767
• t1918: fix silent gh auth failure in approval-helper.sh under sudo on Linux by @marcusquinn in #17766
• t1920: fix planning filter false positive by @marcusquinn in #17770
• GH#17754: fix PR↔issue linkage — require Resolves #NNN in PR bodies by @marcusquinn in #17771

Full Changelog: v3.6.158...v3.6.159