Which of these comments should exist?

A file dense with comments that mostly narrate the code.

Review the comments in the code below. Judge each one, not the code.

Sort every comment into:
- **Keep**: explains why, records a non-obvious constraint, warns about a trap, cites an issue or spec
- **Delete**: restates the code, states the obvious, is decorative, or is a section banner where a function would be clearer
- **Wrong**: no longer matches what the code does. Quote both and say which one to trust
- **Rewrite**: the point is worth making but the comment buries it. Give the replacement

Then list the places with no comment that need one: a magic number with an origin, a workaround for an external bug, a deliberate deviation from the obvious approach, an ordering that matters.

Be strict. Most comments in most files should be deleted.

Code:

Editing and auditing docs. Finding what is stale or undocumented, cutting what the code already says, rewriting for the reader.