0.17.2

Four defects found by building one page with the full loop.

Fixed

• Every mode declares every token name. editorial had no row heights or
  --font-numeric, and product and operator had no ambient durations. A
  project with two modes shares one alias block, so those aliases resolved to
  nothing on the routes of the mode that lacked them; a real site's editorial
  pages had three undefined utilities, and the probe failed them. Each mode now
  states a value for each name (ambient motion is 0s outside editorial),
  and check-tokens Rule 14 fails a mode file that declares a name another
  does not.
• The gate no longer marks a critique as touched by writing its own lock.
  0.17.1 judged only critiques touched this session, but a critique session
  wrote a lock into every critique folder, and the next stop read that write as
  a touch. Locks are now written only for the critiques in play, and the lock
  file is ignored when dating a folder.
• The probe does not take an in-page section list for the site menu. A
  <summary> in a <nav> inside <main>, <article> or <aside> is page
  navigation; judging it as a menu failed a rule page's "More in this section"
  disclosure for not behaving like one.
• Every example fits 320 by 260. The examples README promised about
  320 by 180; one figure was 363px wide and four were taller. The bound is now
  stated as measured, the two outliers are trimmed, and a test renders all 286
  figures in Chrome and fails any wider or taller.