Backup branch created

Autosquash flag used

Interactive rebase used

Rebase not merge for cleanup

force-with-lease push

Test or verification step

Rebase base targets main

--force-with-lease rationale

Backup branch rationale

Rebase squash/fixup operations

Commit message reword

bisect start command

bisect bad marked

bisect good marked

bisect run used

test script exit 0 for good

test script non-zero for bad

bisect reset called

Clean working directory

Bad commit identified

Bisect explanation

worktree add used

Multiple worktrees

cherry-pick for full backport

Partial apply for 1.8

force-with-lease push

worktree remove or prune

No main-branch checkout

Backport log produced

All three releases addressed

Sanitizer applied to 1.8