feat: incoming/ as a queue - raw pending picks the next entry, raw accept takes a whole folder, a file in a subdirectory of incoming/ is refused (#112)

Files changed:
- CHANGES.md
- README.md
- VERSION
- instructions/ingest-large-tree.md
- instructions/wiki-ingest/SKILL.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/chemenu/cli_contract.py
- tools/chemenu/commands/raw_cmd.py
- tools/chemenu/tests/test_raw_cmd.py
- tools/chemenu/tests/test_raw_fetch.py

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

VERSION

@@ -1 +1 @@
-8.0.0-beta.26
+8.0.0-beta.27