docs: tools/README.md module tree names reference_doc.py and the fourth view cli_contract renders (#188)

Files changed:
- CHANGES.md
- VERSION
- tools/README.md

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

CHANGES.md

@@ -14,7 +14,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 
 ---
 
-## 9.0.0-beta.3 - 2026-10-06 - docs reference: human command reference under docs/reference/, generated from the command records
+## 9.0.0-beta.4 - 2026-10-06 - tools/README.md module tree names reference_doc.py and the fourth view cli_contract renders
 
 **Author:** Torben Nehmer
 
@@ -33,6 +33,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 **Low impact**
 - version bump: Abschlussmeldung nennt Stichpunkt oder Themenabsatz statt pauschal Prosa
 - AGENTS.md routing line and a toc.py docstring describe docs/ as the whole human documentation
+- tools/README.md module tree names reference_doc.py and the fourth view cli_contract renders
 <!-- /wikitool:bumps -->
 
 ### Doku-Gerüst nach Diátaxis unter `docs/` (#187)

VERSION

@@ -1 +1 @@
-9.0.0-beta.3
+9.0.0-beta.4

tools/README.md

@@ -81,7 +81,7 @@ tools/
   bugreport.py             the bug-report collector itself - see below
   chemenu/
     cli.py                 Typer app: registers every command, runs the budget gate, renders `-h`/`--help` from cli_contract
-    cli_contract.py         one data record per command (name, synopsis, properties, exit status) - the source `-h`, the index and CONTRACT.md's generated region render from
+    cli_contract.py         one data record per command (name, synopsis, properties, exit status) - the source `-h`, the index, CONTRACT.md's generated region and the human reference under docs/reference/ render from
     config.py              repo layout: root resolution and every path under it
     api.py                 the in-process entry point - point Chemenu at a corpus and read it
     errors.py              ChemenuError / ValidationError / BackendError
@@ -89,6 +89,7 @@ tools/
     filelock.py            an exclusive lock on an open file, flock on POSIX and msvcrt on Windows - the only module that imports either
     prerequisites.py       prerequisites.txt read from Python, plus the platform and long-path questions `doctor` asks
     install_doc.py         INSTALL.md held to the instructions: its prerequisites lists generated from prerequisites.txt, its setup questions matched to setup-instance.md's markers
+    reference_doc.py       the human command reference under docs/reference/: one page per command group, an overview and the exit-42 causes, rendered from the records without what addresses an agent
     corpus_cache.py        one parsed corpus per commit, never cached while the tree is dirty
     kb_scan.py             page iteration/loading over kb/
     blocks.py              generated regions in a page body, found by marker rather than by heading