CLAUDE.md-Importkette entdrifted, Modellwahl nach docs/ verschoben

Files changed:
- AGENTS.md
- CHANGES.md
- CLAUDE.md
- SOUL.md
- USER.md
- VERSION
- docs/model-and-effort-selection.md
- instructions/claude-code-model-selection.md
- instructions/dev/stack-close/SKILL.md
- instructions/dev/stack-dev/SKILL.md

instructions/dev/stack-dev/SKILL.md

@@ -96,7 +96,7 @@ stack development happens in the origin repo instead (see AGENTS.md's routing li
 
    Effort is the cheaper lever than the model, and `high` is the floor for anything touching more
    than one file or a contract. Full table and reasoning:
-   [claude-code-model-selection.md](../../claude-code-model-selection.md).
+   [docs/model-and-effort-selection.md](../../../docs/model-and-effort-selection.md).
 
 4. **Raise the version, if the change ships.** A change under `tools/`, `types/`,
    `instructions/`, `AGENTS.md` or a `CONTRACT.md` reaches every future instance, so it needs a