fix(docs): AGENTS.md-Contract-Prosa als Sitzungsarbeit klargestellt, doc-pull-through-Instruction (schliesst #90)

Files changed:
- AGENTS.md
- CHANGES.md
- VERSION
- instructions/dev/doc-pull-through.md
- instructions/dev/stack-close/SKILL.md
- instructions/dev/stack-dev/SKILL.md
- instructions/dev/testing-conventions.md
- instructions/dev/version-parts.md
- tools/chemenu/commands/docs_verify.py

instructions/dev/doc-pull-through.md

@@ -0,0 +1,67 @@
+---
+type: types/instruction.md
+name: doc-pull-through
+description: Which document makes a claim about a surface you are about to change - a wikitool command's behaviour, a stage's rules, an AGENTS.md rule/gate/invariant, a README-shaped human doc, a docs/ page's reasoning - and so needs updating in the same session, since tools/wikitool docs verify never reads a cell's prose.
+---
+# Update every document that makes a claim about the surface you changed
+
+`tools/wikitool docs verify` is a hard oracle over presence, not content: it checks that a
+command is *listed*, that a contract *exists*, that an ignore canary is (or isn't) caught - never
+what a table cell, a contract section, or a README paragraph actually *says*. A command's flag
+can change, a gate's threshold can move, a contract's wording can go false, and every one of
+those checks stays green (Gitea #90; Gitea #91 narrows what the command-table check matches, but
+adds no reading of cell content). Content quality of every document below is therefore session
+work, the same duty AGENTS.md's Changelog section states for `README.md`/`EVALS.md`/
+`tools/README.md` - this instruction exists because that duty used to stop at those three files
+while the contracts rotted next to a green check (ten stale error-contract rows accumulated this
+way; see Gitea #89 for one).
+
+## When to run
+
+Before `tools/wikitool docs verify`/`publish` in a `stack-dev` session that changed behaviour -
+`stack-dev` step 5 sends you here. Read the table below and update every row whose surface you
+touched; a row that does not apply needs no action.
+
+## Steps
+
+1. **Name the surface(s) you changed.** A `wikitool` command's flags or behaviour, a stage's
+   rule, an `AGENTS.md`-level rule/gate/invariant, a workflow a human runs by hand, or the
+   reasoning behind a design decision - one change can touch more than one row.
+
+2. **For each surface, update every document the table names - not only the one you were already
+   editing:**
+
+   | Touched surface | Document(s) that make a claim about it |
+   |---|---|
+   | A `wikitool` command's behaviour, flags, or interface | Both tables in [tools/CONTRACT.md](../tools/CONTRACT.md): the command reference row, and its per-command error contract (exit codes, atomicity, retry-safety) |
+   | A stage's authoring rules (`raw/`, `kb/`, `types/`, `reports/`, `work/`, `tools/`, `instructions/`) | The touched `<stage>/CONTRACT.md` |
+   | A rule, gate, or invariant `AGENTS.md` itself states | The relevant `AGENTS.md` section (Invariants, Gates, File naming, Routing, ...) |
+   | A workflow, stage, or command a human operates by hand | Whichever of `README.md`, `EVALS.md`, `tools/README.md`, `INSTALL.md`, `DEVELOPMENT.md` names it - AGENTS.md § File naming says which document is for which reader |
+   | The reasoning behind a gate, boundary, or design decision | The `docs/` page that carries it, if one exists (AGENTS.md § File naming lists all four) |
+   | A skill's own step sequence or catalogue | The skill's `SKILL.md` source under `instructions/<name>/` or `instructions/dev/<name>/` |
+
+3. **Do not re-derive what `docs verify` already checks mechanically** - existence, table-row
+   membership, ignore-canary state. That enumeration lives once, in
+   [tools/CONTRACT.md](../tools/CONTRACT.md)'s own `docs verify` row; copying it here would be a
+   second copy that drifts, the exact failure this instruction exists to describe (Gitea #90).
+   This instruction is only about the prose no check reads.
+
+## Decision points
+
+- **The change touched no document in the table?** Nothing to do - not every stack change moves
+  a claim. A pure bugfix with an unchanged interface is the common case.
+- **Unsure whether a `docs/` page's reasoning moved?** Read it. A `docs/` page carries no
+  normative sentence and nothing verifies it by construction (AGENTS.md § File naming), so an
+  unsure guess defaults to reading the page rather than skipping the question -
+  [`stack-close`](stack-close/SKILL.md) step 3 asks it again at the end of the session as a
+  backstop, not as the only time it is asked.
+- **The surface is a whole new stage, collection, or gate?** The table's rows are the steady
+  state; a new row-worthy category is itself a change to this instruction - add the row here
+  rather than leaving the next session to rediscover the gap.
+
+## Scope
+
+Applies to `stack-dev` sessions only - wiki content changes have their own provenance and
+cross-reference rules (`kb/CONTRACT.md`, `wiki-manage`), which already pull the relevant pages
+through as part of the normal skill. Not a replacement for `stack-close` step 3, which re-asks
+the `docs/`-staleness question after publish as the second, session-final check.