chameleon 4.4.54

Fixed

• An idiomatic RSpec spec now yields a canonical witness. A spec's only top-level node is
  RSpec.describe … do, because rspec --init writes .rspec with --require spec_helper and the
  file then carries no top-level require. The Ruby dimension extractor recognized only
  class/module/def/require, so such a spec reported top_level_node_kinds == [], canonical
  selection scored every member trivial, and the test archetype shipped witnessless -- losing the
  per-edit exemplar for essentially every idiomatic RSpec gem. Measured on a paired A/B differing by
  exactly one require "spec_helper" line: bare gave witness=[] and 657 B of per-edit context
  with no witness block; with-require gave a witness and 1,067 B including it. A top-level receiver
  call opening a block (do / {) now counts as a CallNode, so both spellings produce the same
  signature. The block opener is required, so an ordinary top-level statement (puts x, a bare
  Foo.bar) still does not read as a declaration.