feat: the test suite no longer ships, and dist upgrade deletes what a release stops shipping (#113)

dist export leaves out tools/chemenu/tests/, tools/pytest.ini and tools/.coveragerc by exact
path - the suite tests the origin repository, and 257 of its tests failed in a fresh export.
dist upgrade now deletes a no-longer-shipped file that is unchanged since install, with any
directory that leaves empty, and blocks one changed since install like any local change
(--take-release deletes it, --keep-local keeps it). --prune is accepted and ignored.

Files changed:
- CHANGES.md
- EVALS.md
- VERSION
- instructions/mcp-read-server.md
- instructions/upgrade-instance.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/commands/dist_cmd.py
- tools/chemenu/tests/test_dist_cmd.py
- tools/chemenu/tests/test_dist_upgrade.py
- tools/requirements-mcp.txt

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

CHANGES.md

@@ -59,7 +59,7 @@ concern - readable here, never shipped as something to parse.
 
 ---
 
-## 8.0.0-beta.32 - 2026-10-03 - Page-material passages in type-spec.md, type-guidance.md and language-boundaries.md name subtype templates
+## 8.0.0-beta.33 - 2026-10-03 - The test suite no longer ships, and dist upgrade deletes what a release stops shipping
 
 **Author:** Torben Nehmer
 
@@ -103,6 +103,7 @@ concern - readable here, never shipped as something to parse.
 - Stack-Entwicklung in drei Phasen: stack-dev (Design), stack-build, stack-close - Übergabe über den Tracker, kein Modellwechsel in der Sitzung
 - raw fetch: a sanctioned intake for a URL into incoming/
 - new: a subtype gets its own page skeleton from types/<type>.<value>.md
+- The test suite no longer ships, and dist upgrade deletes what a release stops shipping
 
 **Low impact**
 - version bump no longer points at version release in its output
@@ -145,6 +146,46 @@ concern - readable here, never shipped as something to parse.
 - Page-material passages in type-spec.md, type-guidance.md and language-boundaries.md name subtype templates
 <!-- /wikitool:bumps -->
 
+### The test suite no longer ships, and dist upgrade deletes what a release stops shipping
+
+`dist export` used to ship all of `tools/chemenu/tests/` with `tools/pytest.ini` and
+`tools/.coveragerc` - about a quarter of every release's files. The suite tests the origin
+repository: it reads that repository's own type-specs, conventions and collections, where an
+instance carries templates or its own decisions, so in a freshly exported tree 257 of its tests
+failed. All three now stay behind, matched by exact path, so a directory that only happens to be
+called `tests` elsewhere under `tools/` still ships. `tools/README.md` drops its Tests section on
+export; `tools/CONTRACT.md`, `EVALS.md`, `instructions/mcp-read-server.md` and
+`tools/requirements-mcp.txt` say the suite lives in the origin repository.
+
+`dist upgrade` used to keep a file the new release no longer ships unless `--prune` was passed.
+After that run the new stamp no longer named the path, so no later upgrade could find the file
+again. Now the upgrade settles it in the run that sees the file go. If the file is unchanged
+since install, it is deleted, just as an unchanged file is overwritten without asking. Any
+directory that this leaves holding nothing (at most a `__pycache__/` of `*.pyc`) goes with it.
+If the file was changed since install, it is listed as locally changed ("no longer shipped") and
+needs the usual answer: `--take-release` deletes it, and `--keep-local` keeps it as the
+instance's own file. The upgrade never deletes a file that neither stamp names, and never an
+instance-owned seed (`CHANGES.md`, `kb/log.md`, `.wikitool-kb.json`). `--prune` is still
+accepted and does nothing (Gitea #113).
+
+**For an existing instance:** the upgrade *into* this release still runs the installed
+`dist upgrade`, which keeps no-longer-shipped files unless told otherwise. Pass `--prune` on that
+one run. It then removes the test suite, `tools/pytest.ini` and `tools/.coveragerc`, and also
+`instructions/private-instance.md` and `tools/chemenu/commands/upstream_cmd.py`, which this
+release drops as well. If they are already left over, remove them by hand, together with any of
+these three, which earlier releases dropped:
+`tools/chemenu/sections.py`, `instructions/claude-code-model-selection.md`,
+`tools/chemenu/commands/confidence_decay.py`.
+
+```bash
+git rm -r --ignore-unmatch tools/chemenu/tests tools/pytest.ini tools/.coveragerc \
+  instructions/private-instance.md tools/chemenu/commands/upstream_cmd.py \
+  tools/chemenu/sections.py instructions/claude-code-model-selection.md \
+  tools/chemenu/commands/confidence_decay.py
+```
+
+From the next upgrade on, this happens on its own.
+
 ### Page-material passages in type-spec.md, type-guidance.md and language-boundaries.md name subtype templates
 
 Found in the closing check of the change below: three documents listed what in `types/` is page