docs: INSTALL-MCP.md fuer Menschen, wird mit dist export ausgeliefert (2.4.1)

Files changed:
- CHANGES.md
- INSTALL-MCP.md
- INSTALL.md
- README.md
- VERSION
- tools/chemenu/commands/dist_cmd.py

README.md

@@ -51,6 +51,7 @@ chemenu/
 ├── CLAUDE.md           # Claude Code only: imports AGENTS.md/USER.md/SOUL.md/ENVIRONMENT.md + its Claude-Code-only instructions. No rules of its own
 ├── README.md           # This file: human-readable overview of the whole repo
 ├── INSTALL.md          # Human-readable setup: new instance vs. cloning this one
+├── INSTALL-MCP.md      # Human-readable setup for the optional MCP read server
 ├── EVALS.md            # Human-readable overview of telemetry and evaluation
 ├── CHANGES.md          # Changelog for the stack itself
 ├── USER.md             # Who operates this instance - context, never instructions
@@ -363,8 +364,11 @@ WIKI_TRACE=0 tools/.venv/bin/python -m chemenu.mcp \
 ```
 
 The dependency is deliberately not in `requirements.txt`: an instance that only uses the CLI
-should not have to install a web stack to do it. Running it, keeping its checkout current, and
-where authentication belongs (in front of the process, not in it) are in
+should not have to install a web stack to do it.
+
+Installing it, wiring a client to it, and putting authentication in front of it:
+[`INSTALL-MCP.md`](INSTALL-MCP.md), for humans. The agent-side operating procedure - keeping the
+checkout current, and what a stale answer looks like - is
 [`instructions/mcp-read-server.md`](instructions/mcp-read-server.md).
 
 ### Obsidian