feat: raw accept - incoming/ als abgeleiteter Rohablage-Eingang (schliesst #58)

Files changed:
- .gitignore
- CHANGES.md
- README.md
- VERSION
- docs/pipeline-rationale.md
- instructions/bootstrap.md
- instructions/wiki-ingest/SKILL.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/chemenu/cli.py
- tools/chemenu/commands/dist_cmd.py
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/raw_cmd.py
- tools/chemenu/tests/test_dist_cmd.py
- tools/chemenu/tests/test_docs_verify.py
- tools/chemenu/tests/test_raw_cmd.py

.gitignore

@@ -134,6 +134,15 @@ npm-debug.log*
 /.agents/skills/
 /.claude/skills/
 
+# Ingest inbox (see raw/CONTRACT.md and Gitea #58). A human drops a file here
+# under its declared type subdirectory; `wikitool raw accept` promotes it into
+# `raw/`, computing the directory and any bundle from where it sits and how
+# many files move together. Unlike raw/ itself this must NEVER be committed -
+# the promotion is what makes a file immutable, not the drop - so this is the
+# one directory pattern in this file that is deliberately not anchored back
+# open by the content backstop below.
+/incoming/
+
 # Content backstop - keep this block last. Nothing under raw/, kb/ or work/ may
 # be excluded by a pattern above; see the header note for why directory patterns
 # still have to be anchored rather than relying on these negations.