-f means --file after a subcommand but --config-file before it

[dbosk]

Context

Multi-agent bug-fix campaign; noticed in #348.

Observation

content.nw and four quizzes.nw sites declare -f/--file on subparsers; the global parser has -f/--config-file. Different dests, so no value clobbering — but the same short flag changes meaning with position on the command line.

Suggested follow-up

Decide whether to keep (documented quirk) or rename one side; the #348 invariant test deliberately ignores this case since dests differ.