feat(raw): raw derive turns Office files and mail into a folder with the original and a derived text

Adds the import-filter registry (tools/chemenu/filters), the raw derive command with folder form,
path-budget and name checks, DOCX/PPTX/XLSX and EML filters, the pending and accept hints, the
wiki-ingest skill step and the raw/CONTRACT.md section. First of three cuts; containers and
PDF/MSG follow.

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
- instructions/wiki-ingest/SKILL.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/cli_contract.py
- tools/chemenu/commands/raw_cmd.py
- tools/chemenu/filters/__init__.py
- tools/chemenu/filters/html_page.py
- tools/chemenu/filters/mail.py
- tools/chemenu/filters/ooxml.py
- tools/chemenu/tests/test_raw_derive.py
- tools/chemenu/web_capture.py

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

CHANGES.md

@@ -14,7 +14,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 
 ---
 
-## 9.0.0-beta.13 - 2026-10-07 - Gitea-Wiki als generierter Spiegel von docs/: Konverter, Push-Skript, Workflows
+## 9.0.0-beta.14 - 2026-10-08 - raw derive reads PDF-free documents: Office files and mail become a folder with the original and a derived text
 
 **Author:** Torben Nehmer
 
@@ -35,6 +35,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 - Die Formen der vier handgeschriebenen .wikitool-*.json stehen je in einem Datensatz (config_shapes), aus dem Lader, doctor und die Konfigurationsreferenz lesen
 - Gate-Liste: AGENTS.md § Gates ist die eine Liste (mit Rebase-Review Gate), cli_contract.GATES hält sie, docs verify vergleicht beide
 - Asset-Preflight: Verschieben aus dem Entpackordner wird bis ca. 30 s wiederholt, nennt die Systemmeldung und rollt nach endgültigem Scheitern zurück
+- raw derive reads PDF-free documents: Office files and mail become a folder with the original and a derived text
 
 **Low impact**
 - version bump: Abschlussmeldung nennt Stichpunkt oder Themenabsatz statt pauschal Prosa