Group the abcjs modules together

[zmoon]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.60%. Comparing base (57edde3) to head (0e68638).
⚠️ Report is 128 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #91   +/-   ##
=======================================
  Coverage   93.60%   93.60%           
=======================================
  Files          13       13           
  Lines        1517     1517           
=======================================
  Hits         1420     1420           
  Misses         97       97           

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[zmoon]

Specifying the tests' location fixes the error, which seems to have been related to test discover, but should also consider renaming the html module to something that doesn't shadow a built-in.

Edit: but now we're missing the doctests (looks like that's why the cov dropped slightly), so definitely need another solution.

[Copilot]

Pull request overview

This pull request reorganizes the abcjs-related modules into a more structured namespace under pyabc2.abcjs, and renames the optional extras to better reflect their purpose.

Changes:

• Consolidates abcjs modules under pyabc2.abcjs.* namespace (widget, headless, html)
• Renames package extras from widget/sheet to abcjs-widget/abcjs-headless for clarity
• Updates all import statements, documentation, and examples to reflect the new structure
• Updates abcjs documentation URLs from paulrosen.github.io to docs.abcjs.net

Reviewed changes

Copilot reviewed 11 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/test_html.py	Updates import path to new location pyabc2.abcjs.html
tests/test_abcjs_headless.py	Updates import path to new location pyabc2.abcjs.headless
pyproject.toml	Renames extras to abcjs-widget and abcjs-headless
pyabc2/parse.py	Updates widget import path and error message for new extra name
pyabc2/abcjs/widget/index.js	New widget JavaScript implementation file
pyabc2/abcjs/widget/index.css	New widget CSS stylesheet
pyabc2/abcjs/widget/init.py	Widget module with updated docstring and import examples
pyabc2/abcjs/html/init.py	Updates documentation URL to new domain
pyabc2/abcjs/headless/render.js	New Node.js rendering implementation
pyabc2/abcjs/headless/package.json	New Node.js package configuration
pyabc2/abcjs/headless/cli.cjs	New CLI implementation for headless rendering
pyabc2/abcjs/headless/init.py	Updates error message for new extra name and documentation URL
docs/examples/widget.ipynb	Updates all import paths and module references
docs/api.rst	Restructures API documentation with new module hierarchy
.readthedocs.yaml	Updates extra dependencies for documentation build
.gitignore	Updates path for test files in new location
.github/workflows/ci.yml	Adds explicit tests/ directory to pytest command

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