[davidackerman]

The browser engine's Pyodide workers now load any package Pyodide ships the first time their Python imports it. Before, only scipy and scikit-image loaded this way.

• web/src/pyworker.ts. On a failed import, the worker looks the module up in Pyodide's lockfile (py.lockfile, which lists the modules each package provides) and loads that package. This replaces the LAZY table. There is no new option, so a page imports inside its function and lists nothing.
  • In 0.28.3, PIL maps to Pillow, scipy to scipy and skimage to scikit-image.
  • A module Pyodide doesn't ship fails as before.
• Why. cellmap-flow asked for Pillow, to drop its numpy copy of Pillow's resampling. That copy already drifts from Pillow 13.
• Docs. design.md (another page on the engine) and the CHANGELOG, under a new Unreleased heading. tests/test_docs.py's version check now skips that heading, and contributing.md's release steps name it.