Sweep reds: base first, then affected PRs

Read ../_shared/base-green.md and ../_shared/validation-gate.md. Success means verified required checks, not a disappearing incident or green wrapper.

Boundaries

• Never merge, close PRs or change release-freeze state through this skill.
• Never stash, alter the shared checkout, or touch another session's active worktree.
• Never weaken assertions, expand tolerances, suppress failures or raise a baseline to make a check green. A proven workflow defect requires an explicitly scoped gate-repair task; ordinary sweep authorization does not authorize CI mutation.
• Run live credentialed/paid tests, deployment or trust approvals only with the appropriate owner authorization. Missing access is HOLD, not PASS.

A. Base health