fix(pr-pipeline): issue lane runs check-affected before pushing so lane PRs don't open red #8310

Attended Build hand-fixed red lane PRs (#7892, #7932, #7940, #7942, 2026-10-18). Every failure was one the lane could have caught before pushing: skill-name registry entries, cheatsheet metadata, /home/<user> paths in eval fixtures, typos, and shellcheck SC2016. 36 red lane PRs remain.

Remove the cause instead of fixing it after the fact: the issue lane (work-resolve-issue) runs scripts/check-affected.sh on its change before it pushes, and fixes what it finds in the same run. fix-ci (#7031) stays as the fallback for anything that still turns red.

Note: most lane branches are about 140-150 commits behind main, so the pre-push stale-base hook will also ask for a merge. The lane should merge main first.

Refs: #7031