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

tools/README.md

@@ -118,6 +118,7 @@ tools/
     kb_state.py            the KB version (.wikitool-kb.json) and the migration chain
     corpus_diff.py         invariant comparison of kb/ between two revisions
     web_capture.py         `raw fetch`'s core: fetch a page, decide its charset, derive Markdown-like text from the HTML - standard library only, deterministic
+    sites/                 the site handlers behind `raw fetch`: a registry (`__init__.py`) and one module per website, each registering the standard form of its URLs, the page furniture to leave out of the derived text, and hint lines - all of it data (rewrites, selectors, text), standard library only
     filters/               the import filters behind `raw derive`: a registry (`__init__.py`) and one module per format family (HTML, mail, Outlook MSG, Office, PDF, ZIP), each registering the extensions it reads - standard library, or a package imported lazily so a missing one fails only its own format
     repo_capture.py        `raw capture`/`raw status`'s core: resolve a ref rule, fetch it into a bare cache, select files by glob as blobs, the `_capture.json` manifest - git with the host's credentials, never a prompt; plus the one write back, a single-file commit pushed without force for `export guidelines`
     guideline_export.py    `export guidelines`' core: select pages by `search` predicates, render them into one deterministic GUIDELINES.md, and recognise an export again (`EXPORT_MARKER`) - with no CLI attached