v0.53.0 — super-ux

Closes ssheleg/sshlg-skills#96.

A metric is built to end an argument about coverage. Then the rule that decides what a
document is ABOUT turns out to be one line of string handling, and the number reports work
that exists as work that is missing — and the number now generates work that is fictional.

Measured: a screen inventory decided a screen was documented when a scenario named its path
as the primary entry point, taking the first backticked path from Entry point: whole.
Two scenarios name their subject with a query string — /reset-password?token=… and
/account/billing/return?invoice=&status= — so both matched no route, and two screens
that had always been documented were published as having no scenario at all. The board row
that followed named nine screens needing scenarios: two needed nothing, and a third was one
component at two addresses, which the rule can only ever name one of. Three of nine rows
were fiction, in a number whose whole purpose was to stop people arguing about coverage from
memory.

ux-audit now carries three rules for any metric over these documents:

• the aboutness rule is a named, exported function with a table of synthetic inputs,
  including the negative cases — query strings, fragments, several paths in one field,
  prose with no backticks. It was untestable while it was an inline regex, which is exactly
  why it was never tested;
• a metric that cannot express a real state says so beside the number rather than
  counting that state as a failure. One screen at two addresses is one screen, and the
  matrix carries a derived alias routes line instead of silently ranking the second
  address undocumented;
• a deliberate, hard-won rule is a reason to test it, not to trust it. This one had
  already replaced a looser rule twice, each time after a screen was reported covered on a
  mention rather than on a subject — and a rule with that history is the last one anybody
  re-reads.