docs: add CONTRIBUTORS (org + core team + Claude)

CONTRIBUTORS.md

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+# Contributors
+
+This repository is built by **[RFI-IRFOS](https://github.com/rfi-irfos)** — the Research
+Focus Institute · Interdisciplinary Research Facility for Open Sciences (Graz, Austria) —
+a regulated Austrian not-for-profit. It is the work of a small core team, with AI
+pair-programming by Claude.
+
+## Core team
+
+| Member | GitHub | Role |
+|---|---|---|
+| Simeon Kepp      | [@simeon-kepp](https://github.com/simeon-kepp)           | Co-founder · admin |
+| aiqueenofaustria | [@aiqueenofaustria](https://github.com/aiqueenofaustria) | Core team · admin |
+| CobioEarth       | [@cobioearth](https://github.com/cobioearth)             | Core team · admin |
+| csonikoletta     | [@csonikoletta](https://github.com/csonikoletta)         | Core team · admin |
+| LouisUhr         | [@louisuhr](https://github.com/louisuhr)                 | Core team · admin |
+| Zabih            | [@zabih-sudo](https://github.com/zabih-sudo)             | Core team · admin |
+
+## AI collaborator
+
+- **Claude** — AI pair-programmer (Anthropic), credited via `Co-authored-by:` trailers across the codebase.
+
+---
+
+<sub>&copy; 2026 RFI-IRFOS · <a href="https://ternlang.com">ternlang.com</a> · at least 90% of surplus reinvested in the research mission.</sub>