sites: raw fetch gets site handlers - standard URL form, per-website cleanup and CHECK hints as a code registry, learn.microsoft.com first, plus a sites settings section (#200); 10.0.0-beta.3

Files changed:
- tools/chemenu/sites/ (registry, learn-microsoft handlers), web_capture.py, commands/raw/fetch.py, config_shapes.py
- tests, fixture, raw/CONTRACT.md, tools/README.md, docs, CHANGES.md, VERSION

Files changed:
- CHANGES.md
- VERSION
- docs/how-to/ingest-a-source.md
- docs/reference/commands/README.md
- docs/reference/commands/raw-material-and-uploads.md
- docs/reference/configuration.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/commands/raw/fetch.py
- tools/chemenu/config_shapes.py
- tools/chemenu/reference_doc.py
- tools/chemenu/sites/__init__.py
- tools/chemenu/sites/learn_microsoft.py
- tools/chemenu/tests/fixtures/learn_microsoft/oslicense-module.html
- tools/chemenu/tests/test_config_shapes.py
- tools/chemenu/tests/test_sites.py
- tools/chemenu/web_capture.py

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

VERSION

@@ -1 +1 @@
-10.0.0-beta.2
+10.0.0-beta.3