Ignoring Files

Note	Draft placeholder — outline notes only; prose not yet written.

Points this section needs to cover:

.gitignore pattern rules in depth (globs, negation, directory patterns, double-asterisk)
Nested .gitignore files and their scoping
Global excludes: core.excludesFile and per-repo .git/info/exclude
Debugging why a file is ignored with git check-ignore --verbose
Ignoring build artifacts, editor droppings, and agent-generated files (cross-reference Ch 7, Git and Agents)