Large-Redesign Parallel-Branch Collision Audit
Problem
You're about to start a large multi-PR redesign that branches from main. The branch is clean, tests are green, the plan is locked. You execute 14 PRs overnight, all merge cleanly to main.
The next day someone asks: "What about the changes on starbucks-uk / feature/whitelabel-X / staging-customer-Y?" — and you discover that long-running branch has 10 unmerged commits, including a11y/safety hotfixes on a file (progress.html,
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