v4.2.0

JavaScript is part of a project the way CSS is. A .js file under src/
is a plain browser script, linked on every page as written, and what it
declares is in scope by name — checked, documented and offered by the
editor. external is gone; wf migrate rewrites it.

Breaking

• external is removed. A remote module is a meta.scripts entry, a
  local one a script under src/, and a custom element
  Element("tag", …). wf migrate does all three; a call into a remote
  module external typed is Any afterwards.
• Every .js under src/ ships, on every page. wf migrate lists the
  ones a project already has.

New

• Your own scripts. Top-level function, class, const, let,
  var and window.x = … are names .wf calls directly. A call is held to
  the parameters (T10) and to the JSDoc types (T01); @returns types
  the result; a class is constructed. Collisions with another script, a
  declaration or a name the language owns are errors. An ES module under
  src/ stops the build; an unreadable file is linked with a warning.
• meta.scripts: libraries by URL, linked before the project's
  scripts, their origins added to the policy; module: true, as: imports
  an ES module; globals puts a library's names in scope as Any.
• mount:, update:, cleanup: on every element and component call,
  and wf:render on document once per drawing.
• Element("tag-name", …) places any custom element, in the SPA, the
  static paint and the template engine.
• class: takes a map and a list, and an if with no else is null
  when it fails. V04 flags a borrowed wf- class.
• Editor: completion, hover and go-to-definition for script names and
  for the classes .css files define, inside class:; the server watches
  .js and .css files.
• wf audit lists the scripts and their names; wf types their
  signatures; acting wf test pages link them.

Fixed

• What an if branch, match arm, list item or slot fill made is
  disposed of with its page. A route change used to leave its effects,
  timers and Host cleanups running.
• An IconButton whose class: reads state kept its own classes; it used
  to have them replaced.

Tooling

• scripts/check.sh (just check) runs formatting, clippy and the build
  one by one, as CI does; --fix formats first, --test runs the tests.
  just lint and just fmt-check now match CI too.
• Editors: the VS Code extension (0.4.0) and the Zed extension (3.2.0)
  drop external and re-read the project when a .js or .css file
  changes.

Full Changelog: v4.1.2...v4.2.0