ci: fail the build when documentation falls behind

Adding a flag and forgetting the man page was the kind of thing only a reader
would catch, and the README had already drifted: it documented seven of fifteen
flags, claimed three cross-compilation targets where the Makefile builds six,
and its example output predated the humidity column.

Flag definitions move into defineFlags(), so the test enumerates the same set
run() does rather than a hand-copied list that could drift in its own right.
usage() gains a writer so its output can be captured. Tests then assert that
every flag reaches -h, the README and the man page; that every key written into
the generated config is documented; and that every column name is explained.

The man page check normalises roff's \- hyphen escape first -- without that,
every multi-word flag looks undocumented when it is not.

0 files changed, 0 insertions, 0 deletions