docs: remove cross-references to the architecture testing repository

AGENTS.md

@@ -167,7 +167,7 @@ Tests live in `src/tests/BuildSdk.IntegrationTests/PurviewSkillValidationTests.c
 
 ## Purview.Skills.Testing
 
-`src/src/SkillsTesting/` ships a second package: the Agent Skills conformance rule set, shaped exactly like the architecture rule engine (which now lives in its own repository, [`purview-dev/architests`](https://github.com/purview-dev/architests)) and for the same reason — the rules are defined once rather than reimplemented in every repository that authors skills.
+`src/src/SkillsTesting/` ships a second package: the Agent Skills conformance rule set. It is shaped for the same reason as every rule engine: the rules are defined once rather than reimplemented in every repository that authors skills.
 
 Three layers, deliberately separated:
 
@@ -230,16 +230,6 @@ The caller owns the ref in that case — append `#<ref>` to pin it. This path ne
 
 Tests live in `src/tests/BuildSdk.IntegrationTests/PurviewSkillResolutionTests.cs`, including the guarantee that an ordinary restore-and-build writes no lockfile and creates no agent directory.
 
-## Purview.Architecture.Testing has moved
-
-The architecture rule engine (`Purview.Architecture.Testing`) used to live at `src/src/ArchitectureTesting/`, with its policy schema at the repository root and its skill in `skills/`. It now lives in its own repository, [`purview-dev/architests`](https://github.com/purview-dev/architests), which owns the package, the `architecture-policy.schema.json` schema, the tests and the `purview-architests` skill.
-
-This repository no longer packs `Purview.Architecture.Testing`, and `.config/purview-build.json` no longer validates it. Install the skill from its new home:
-
-```bash
-npx skills add purview-dev/architests
-```
-
 ## Repository map
 
 - `src/src/SkillsTesting/` — packable agent-skill rule engine (`Purview.Skills.Testing`)

skills/purview-buildsdk-skill-tests/SKILL.md

@@ -108,8 +108,8 @@ Overrides: `RepositoryRoot` (default: the SDK's repository-root marker walk),
 `SkillsFolderName` (default `skills`), and `SkipRule(string)`.
 
 The evaluator takes a `SkillCatalogue`, so a rule can be exercised against a fixture folder rather
-than a real repository — the same three-layer shape as the architecture rule engine in
-[`purview-dev/architests`](https://github.com/purview-dev/architests).
+than a real repository — the same three-layer shape this repository uses throughout: a reader, an
+evaluator over an in-memory model, and a thin test base class.
 
 ### At pack time — `ValidatePurviewSkills`
 

src/src/SkillsTesting/SkillsTesting.csproj

@@ -15,9 +15,7 @@
 		<!--
 			The package name is Purview.Skills.Testing, not Purview.BuildSdk.SkillsTesting: it is
 			consumed by repositories that have no relationship to this SDK beyond building with it.
-			Setting RootNamespace keeps IDE0130's folder check aligned with that choice. Mirrors
-			Purview.Architecture.Testing, which is packaged the same way in its own repository
-			(purview-dev/architests) for the same reason.
+			Setting RootNamespace keeps IDE0130's folder check aligned with that choice.
 		-->
 		<RootNamespace>Purview.Skills.Testing</RootNamespace>
 		<AssemblyName>Purview.Skills.Testing</AssemblyName>