linter

I Only Want to See the Lines the Agent Added: A Changed-Lines Convention Linter

I asked an agent for a small fix, it touched an old file, and the linter threw 13 warnings with no way to tell which were the agent's. Scoping the linter to only the added lines dropped 13 to 3 — about 77% less noise. Here is how to pull added lines out of a diff and check only those, with working code.