feat: INSTALL.md held to the installation instructions - prerequisites lists generated from the manifest, setup questions checked by docs verify (#154)

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

Files changed:
- CHANGES.md
- INSTALL.md
- VERSION
- instructions/dev/doc-pull-through.md
- instructions/dev/stack-close/SKILL.md
- instructions/setup-instance.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/cli_contract.py
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/install_doc.py
- tools/chemenu/tests/test_install_doc.py

instructions/dev/doc-pull-through.md

@@ -41,6 +41,8 @@ touched; a row that does not apply needs no action.
    | A task-tracker adapter (`tools/chemenu/tasks/`), its recorded fixtures, or the live suite | [instructions/dev/tracker-testing.md](tracker-testing.md), and `MANIFEST.json` beside the fixtures when they were re-recorded |
    | A skill's own step sequence or catalogue | The skill's `SKILL.md` source under `instructions/<name>/` or `instructions/dev/<name>/` |
    | A per-checkout configuration file an instance owns (`.wikitool-tasks.json`, `.wikitool-telemetry.json`, `.wikitool-remotes.json`, `.wikitool-upload.json`) | [INSTALL.md](../../INSTALL.md) § Konfiguration, where an operator looks the shape up; the [setup-instance.md](../setup-instance.md) decision point that offers it during setup; and `doctor`'s own row in [tools/CONTRACT.md](../../tools/CONTRACT.md), since `doctor` is what reports the file's state |
+   | An installation instruction - [preflight.md](../preflight.md), [setup-instance.md](../setup-instance.md), [bootstrap.md](../bootstrap.md), [upgrade-instance.md](../upgrade-instance.md) - or `tools/prerequisites.txt` | [INSTALL.md](../../INSTALL.md), the human guide to the same procedure. Read it against the instruction: what to prepare, the sentence for the agent, what the agent asks, where it stops and why. `docs verify` checks only the two enumerable overlaps - the prerequisites lists, which `wikitool docs prerequisites --apply` regenerates from the manifest, and the setup questions: a question the agent asks the user carries `<!-- setup-question: <key> -->` where it is asked in `setup-instance.md`, and `INSTALL.md` § "Was der Agent dich fragt" names it with the same marker. Every other sentence is this session's to compare. `INSTALL.md` does not retell the steps, so a change to their order or wording alone moves nothing there |
+   | [dev-setup.md](dev-setup.md) | [DEVELOPMENT.md](../../DEVELOPMENT.md), read against it the same way - nothing checks this pair at all |
    | A new page type the stack requires, or a new collection | Its type-spec and `COLLECTION.md` (both as the `.template` an instance adopts), the collection table in [kb/CONTRACT.md](../../kb/CONTRACT.md), and **both adoption paths**: [setup-instance.md](../setup-instance.md) for a fresh instance and [upgrade-instance.md](../upgrade-instance.md) for an existing one, where an unadopted template is what `docs verify` refuses |
 
 3. **A heading you changed means a table of contents to regenerate - by the tool, never by

instructions/dev/stack-close/SKILL.md

@@ -105,6 +105,14 @@ and a fresh subagent starts without the session's context).
    behaviour one of these documents describes, update it now; if none did, say so rather than
    leaving the question unasked.
 
+   **If the published diff touches an installation instruction, read the human guide against
+   it once more.** Which instructions those are and which human document answers for each is
+   the pull-through table's row in `instructions/dev/doc-pull-through.md` - `stack-dev` step 5
+   applied it before the publish; this is the second reading, after. A deviation found here is
+   filed as a follow-up issue naming both files and the sentence that disagrees, rather than
+   fixed in this phase: the pull-through before the publish missed it, and that miss is worth a
+   record of its own.
+
    **If that update moved a `##`/`###` heading, the file's table of contents is now stale** -
    regenerate it with `tools/wikitool docs toc --apply`, never by editing the list. The region
    is generated (AGENTS.md invariant 1), `docs verify` fails on stale exactly as on missing, and