stack: MCP submit-Tool mit Upload Review Gate und Quarantäne-Schreibpfad (schliesst #32)

Files changed:
- .gitignore
- AGENTS.md
- CHANGES.md
- INSTALL-MCP.md
- README.md
- VERSION
- docs/why-gates-are-code.md
- instructions/gates.md
- instructions/ingest-queue.md
- instructions/mcp-read-server.md
- instructions/wiki-ingest/SKILL.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/chemenu/cli.py
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/upload_cmd.py
- tools/chemenu/config.py
- tools/chemenu/mcp/server.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_mcp_server.py
- tools/chemenu/tests/test_upload.py
- tools/chemenu/tests/test_upload_cmd.py
- tools/chemenu/upload.py

README.md

@@ -74,7 +74,11 @@ chemenu/
 │   ├── page-lifecycle.md
 │   ├── publish-cycle.md
 │   ├── ingest-large-tree.md
+│   ├── ingest-queue.md # Reviewing a submission before wikitool upload accept promotes it
 │   └── wiki-*/SKILL.md # Skills - copied into .agents/skills/ and .claude/skills/
+├── mcp-upload/         # QUARANTINE (optional): the MCP `submit` tool's write path, gitignored -
+│                       #   read by no command in the ordinary pipeline; a human reviews it with
+│                       #   `wikitool upload list/show/accept/reject`
 ├── incoming/           # INBOX: gitignored and flat - drop a file here, `raw accept` promotes it
 ├── raw/                # INPUT: immutable, untrusted source material
 │   ├── CONTRACT.md     # Date shard, capture fields, immutability, untrusted content
@@ -180,6 +184,11 @@ working *with* it.
    - Add cross-references between everything
    - Rebuild the catalog and append to `kb/log.md`
 
+A document can also arrive from outside, through the MCP server's optional `submit` tool
+(see [INSTALL-MCP.md](INSTALL-MCP.md)): it lands in `mcp-upload/`, not `incoming/`, and a human
+reviews and promotes it with `wikitool upload accept` before step 1 above applies - see
+[instructions/ingest-queue.md](instructions/ingest-queue.md).
+
 ### Querying Knowledge
 
 Ask questions naturally: