tools: Export - include "all" wählt die ganze KB, index: true schreibt index.md und INDEX.md in den Zielordner (#217); 10.1.0-beta.21

Files changed:
- CHANGES.md
- VERSION
- docs/how-to/export-to-a-synced-folder.md
- docs/reference/commands/exports.md
- docs/reference/configuration.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/catalog.py
- tools/chemenu/commands/export_cmd.py
- tools/chemenu/commands/index_build.py
- tools/chemenu/config_shapes.py
- tools/chemenu/export_index.py
- tools/chemenu/guideline_export.py
- tools/chemenu/page_export.py
- tools/chemenu/tests/test_config_shapes.py
- tools/chemenu/tests/test_export_run.py
- tools/chemenu/tests/test_index_build.py

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

raw/CONTRACT.md

@@ -99,9 +99,9 @@ both ways out - the whole folder, or the file moved up into `incoming/`.
 own output and `raw accept` refuses it, given on its own, inside a folder, or as
 `--replaces`/`--replaces-bundle` material, naming each one. The marker is either a first line
 (after an optional BOM) that starts with `<!-- wikitool:export` - the generated `GUIDELINES.md` of
-`export guidelines` - or, in a leading frontmatter block, a `wikitool_export:` key - a page
-`export run` wrote. A converter of an `export` target may drop the marker, so `raw accept` also
-refuses a file whose sha256 is listed in the manifest of a configured target; a missing manifest
+`export guidelines` - or, in a leading frontmatter block, a `wikitool_export:` key - a file
+`export run` wrote, a page or an index file. A converter of an `export` target may drop the marker,
+so `raw accept` also refuses a file whose sha256 is listed in the manifest of a configured target; a missing manifest
 or a broken `export` section is a `WARN` and the check is skipped. Taken in, an export would turn
 the wiki's knowledge on its way out into a source the wiki then cites for the same claims.
 `raw capture` leaves a file with the marker out of a repository for the same reason