⚙️ [Maintenance]: Claude Code instructions no longer ship (#48)

New module repositories no longer include a Claude Code-specific
instruction file. Agent guidance remains available through `AGENTS.md`.

---
<details>
<summary>Technical details</summary>

- Removed the obsolete root `CLAUDE.md`; no repository references
existed.
- Standards and framework alignment:

| Changed surface | Standards checked | Framework docs checked | Result
|
| --- | --- | --- | --- |
| `CLAUDE.md` (agent instruction file) | Natural Language | None (no
framework-specific docs) | Aligned |

- Issue convergence sweep: searched open issues for `Claude`; none
matched this change.

</details>

<details>
<summary>Relevant issues (or links)</summary>

### Related work
- No related issue; direct maintenance request.

</details>

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug