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

VERSION

@@ -1 +1 @@
-9.0.1-beta.1
+9.0.1-beta.2