contextlake 8.13.0

Changed

• The ambiguity fanout cap is 10, not 6, and stores re-index to pick it up. A call
  reference naming a symbol defined in more than the cap's many places produces no edge at
  all, so the caller is simply absent from "who calls X". Measured with the cap removed on
  the two largest ambiguity contributors in a 717,381-node store, the old cap was dropping
  29.6% and 37.0% of resolvable call references. The comment beside it claimed 21.6%
  and "no knee in the distribution"; both were wrong. There is a knee, and 10 sits on it:
  76.2% and 80.6% of references for 1.22x and 1.52x the ambiguous edges.

  Admitting everything is still wrong, for a sharper reason than the old note gave. The
  uncapped cost is one or two pathological names per repository: 2,864 sites naming a
  symbol with 1,432 definitions produced 4.1M edges by themselves, 92% of that
  repository's uncapped total.

  PARSER_VERSION moves to 12, so existing stores re-index rather than keeping edges
  built under the old cap.

Added

• Zoom in and zoom out buttons on the graph toolbar. Zoom level could only be chosen
  by wheel or pinch. Pinch is a multipoint gesture, and WCAG 2.5.1 (Level A) wants a
  single-pointer alternative; "Fit to view" sets a zoom level but does not let you pick
  one. Each press steps by a fixed ratio about the viewport centre.

  Wheel zoom got more responsive alongside them: wheelSensitivity was 0.2, so reaching
  a readable scale took a dozen notches and the canvas read as stuck. It is now 1.

Fixed

• Every graph and dashboard page requested a favicon that did not exist, producing a
  404 in the console on each load. Both now carry an inline SVG icon, which costs no
  request and survives an offline export.

• kb dashboard --site <dir> overwrote files it did not write. The export writes
  index.html unconditionally, so pointing it at a directory holding anything else --
  a docs site, a hand-maintained landing page -- replaced that content silently, with the
  command reporting success. It now refuses any directory containing files the export does
  not itself produce, naming what it found. Re-running into a previous export stays
  idempotent and needs no flag.