chore: use agents.md instead of claude.md

Author: mburri

AGENTS.md

@@ -0,0 +1,26 @@
+# AGENTS.md
+
+## Product
+
+This is a Next.js-based data visualization platform that allows users to create
+interactive charts from RDF/SPARQL data sources.
+
+## Approach
+
+- Think before acting. Read existing files before writing code.
+- Be concise in output but thorough in reasoning.
+- Prefer editing over rewriting whole files.
+- Do not re-read files you have already read unless the file may have changed.
+- Test your code before declaring done.
+- No sycophantic openers or closing fluff.
+- Keep solutions simple and direct. No over-engineering.
+- If unsure: say so. Never guess or invent file paths.
+- User instructions always override this file.
+
+## Efficiency
+
+- Read before writing. Understand the problem before coding.
+- No redundant file reads. Read each file once.
+- One focused coding pass. Avoid write-delete-rewrite cycles.
+- Test once, fix if needed, verify once. No unnecessary iterations.
+- Budget: 50 tool calls maximum. Work efficiently.