docs: README-Typenbaum und language-boundaries auf den guidance-Split nachgezogen (#104)

Files changed:
- README.md
- docs/language-boundaries.md

docs/language-boundaries.md

@@ -16,7 +16,7 @@ and which argument for it turned out to be wrong.
 - [Why the control plane's language is English](#why-the-control-planes-language-is-english)
 - [Why it is not a parameter](#why-it-is-not-a-parameter)
 - [What the KB language still decides](#what-the-kb-language-still-decides)
-- [Where the line runs inside one file](#where-the-line-runs-inside-one-file)
+- [Where the line runs around a page type](#where-the-line-runs-around-a-page-type)
 - [What would put this back on the table](#what-would-put-this-back-on-the-table)
 <!-- /wikitool:toc -->
 
@@ -99,15 +99,24 @@ experiences:
 So an operator who reads no English gets German pages and German answers from an agent reading
 English instructions. The English is what the machinery is written in, not what it says back.
 
-## Where the line runs inside one file
+## Where the line runs around a page type
 
-One file shape carries both halves, and it is worth knowing which is which before editing it: a
-page type-spec (`types/entity.md` and its three siblings). Its authoring guidance addresses an
-agent; its `## Template` block and `layout:` titles become the literal headings of pages; its
-field names and enum values are identifiers and are translated in neither direction.
-[types/type-spec.md § Who owns a type-spec](../types/type-spec.md#who-owns-a-type-spec) has that
-split as a table, and [ownership-and-templates.md](ownership-and-templates.md) § "Where the file
-boundary strains" has what it costs to keep two audiences in one file.
+A page type's contract is where the two languages meet most closely, and it is worth knowing
+which part is which before editing any of it. Its authoring guidance addresses an agent and is
+English; its `## Template` block and `layout:` titles become the literal headings of pages and
+follow the KB language; its field names and enum values are identifiers and are translated in
+neither direction.
+
+The language line did not move when the *file* line did. A `root: kb` type-spec may now put its
+authoring guidance in a separate, stack-owned `types/<name>.guidance.md` rather than carrying it
+beside the template, but that split was made for ownership reasons - so an upgrade can improve
+the guidance without overwriting what the instance chose - and it leaves this page's argument
+untouched: each part is still written in the language its own reader needs, and a type-spec that
+declares no `guidance:` keeps both halves in one file with exactly the same rule applying inside
+it. [types/type-spec.md § Who owns a type-spec](../types/type-spec.md#who-owns-a-type-spec) has
+the split as a table, and [ownership-and-templates.md](ownership-and-templates.md) § "Where the
+file boundary used to strain" has what it cost to keep two audiences in one file for as long as
+it did.
 
 ## What would put this back on the table