tools: command records, Private instances group - one line per cause, examples, prohibitions (#142)

Files changed:
- CHANGES.md
- VERSION
- tools/CONTRACT.md
- tools/chemenu/commands/upstream_cmd.py

CHANGES.md

@@ -59,7 +59,7 @@ concern - readable here, never shipped as something to parse.
 
 ---
 
-## 7.1.0-beta.18 - 2026-09-26 - Command records, Content migrations group: one line per cause, examples, prohibitions
+## 7.1.0-beta.19 - 2026-09-26 - Command records, Private instances group: one line per cause, examples, prohibitions
 
 **Author:** Torben Nehmer
 
@@ -87,6 +87,7 @@ concern - readable here, never shipped as something to parse.
 - Command records, Types, instructions and docs group: one line per cause, examples, prohibitions
 - Command records, Telemetry group: examples, the missing --fail-on-error exit line
 - Command records, Content migrations group: one line per cause, examples, prohibitions
+- Command records, Private instances group: one line per cause, examples, prohibitions
 <!-- /wikitool:bumps -->
 
 ### CalDAV task-tracker provider (Nextcloud Tasks, iOS Reminders); review reports unknown-value findings instead of skipping them
@@ -316,6 +317,13 @@ never advance the version with `baseline --force` or by editing `.wikitool-kb.js
 behind counting marker pairs rather than comparing their names, and behind an offered migration
 ignoring the chain, moved into the `verify` and `done` docstrings.
 
+### Command records, Private instances group: one line per cause, examples, prohibitions
+
+`upstream merge` and `upstream verify` rewritten the same way; text only. `upstream merge`'s
+single paragraph is now one bullet per step of the merge, and its exit-1 causes - including the
+fetch failure, a failing git step inside the open merge, and the post-commit leak, which its old
+record mentioned only in passing - each carry their own reaction.
+
 ---
 
 ## 7.0.0 - 2026-09-22 - Task-Tracker-Anbindung: Vorhaben als Seitenart, Verpflichtungsschicht, Weekly Review als Read-Time-Join