tools: raw_cmd.py split into the package commands/raw/, one module per subcommand (#206)

Pure restructuring: every raw subcommand's output, help text and exit code is unchanged; the shared helpers sit in raw/_common.py.

Files changed:
- CHANGES.md
- VERSION
- tools/README.md
- tools/chemenu/cli.py
- tools/chemenu/commands/raw/__init__.py
- tools/chemenu/commands/raw/_common.py
- tools/chemenu/commands/raw/accept.py
- tools/chemenu/commands/raw/capture.py
- tools/chemenu/commands/raw/derive.py
- tools/chemenu/commands/raw/fetch.py
- tools/chemenu/commands/raw/pending.py
- tools/chemenu/commands/raw_cmd.py
- tools/chemenu/tests/test_docs_verify.py
- tools/chemenu/tests/test_export_guidelines.py
- tools/chemenu/tests/test_raw_capture.py
- tools/chemenu/tests/test_raw_cmd.py
- tools/chemenu/tests/test_raw_derive.py
- tools/chemenu/tests/test_raw_derive_testfiles.py
- tools/chemenu/tests/test_raw_fetch.py
- tools/chemenu/upload.py

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

CHANGES.md

@@ -14,13 +14,14 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 
 ---
 
-## 9.0.1-beta.1 - 2026-10-10 - Ketten von Paketen: stack-dev schreibt ## Kette, stack-close nennt das nächste Glied
+## 9.0.1-beta.2 - 2026-10-10 - raw_cmd.py in ein Paket zerlegt: ein Modul je Unterkommando, Ausgabe unverändert
 
 **Author:** Torben Nehmer
 
 <!-- wikitool:bumps -->
 **Low impact**
 - Ketten von Paketen: stack-dev schreibt ## Kette, stack-close nennt das nächste Glied
+- raw_cmd.py in ein Paket zerlegt: ein Modul je Unterkommando, Ausgabe unverändert
 <!-- /wikitool:bumps -->
 
 ---