docs(verification): flag that enumerated lint/test gates skip new files

A green check only covers the files the gate actually ran on. When a lint, test, or format gate uses a hand-maintained file list instead of a glob, a newly-added file is silently skipped and the gate still reports clean. Added a subsection naming the failure mode (a Makefile path list, a pre-commit files: regex, a CI matrix, a coverage include list) and the check it calls for: when you add a file, confirm each gate discovers it before trusting the green.

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