Add agents file

AGENTS.md

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+# Development Rules
+
+## First Message
+If the user did not give you a concrete task in their first message, read README.md
+
+## Commands
+- NEVER commit unless user asks
+
+## GitHub Issues
+- We're dogfooding hard here, so always read them locally (unless you need comments)
+
+go run ./cmd/gh-issue-sync pull
+cat .issues/open/NUMBER-*.md
+
+## Tools
+- Use our own github issue sync (go run ./cmd/gh-issue-sync) for most operations
+- GitHub CLI for issue comments/PRs
+- TUI interaction: use tmux
+
+## Style
+- Keep answers short and concise
+- No emojis in commits, issues, PR comments, or code
+- No fluff or cheerful filler text

CLAUDE.md

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+@AGENTS.md