Create AGENTS.md and CLAUDE.md

AGENTS.md

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+# Agents Guide
+
+## Project Overview
+
+`data_nexus` is a Ruby client gem for Dart Health's Data Nexus API. It wraps the API using Faraday and provides resource-based access.
+
+## Structure
+
+- `lib/data_nexus/` - Main gem code
+  - `client.rb` - Entry point for API interactions
+  - `configuration.rb` - Config (API keys, base URL, etc.)
+  - `connection.rb` - Faraday HTTP connection setup
+  - `resources/` - API resource classes
+  - `collection.rb` - Collection handling
+  - `errors.rb` - Custom error classes
+  - `version.rb` - Gem version (bump here for releases)
+- `spec/` - RSpec tests
+- `.github/workflows/` - CI and release automation
+
+## Development
+
+- Ruby >= 3.0.0
+- Run `bundle install` to install dependencies
+- Run `bundle exec rspec` to run tests
+- Run `bundle exec rubocop` to lint
+
+## Releasing
+
+1. Bump the version in `lib/data_nexus/version.rb`
+2. Merge to `main`
+3. Create a GitHub Release with tag `vX.Y.Z` matching the version
+4. The release workflow runs tests, verifies the version/tag match, builds, and pushes to RubyGems
+
+## When to Suggest a Release
+
+Only suggest a release when there are meaningful changes to the gem's shipped code (anything under `lib/`). Changes that do NOT warrant a release on their own:
+- Dependabot dependency bumps (dev dependencies, Gemfile.lock-only changes)
+- CI/workflow config changes
+- Test-only changes
+- Documentation updates
+
+Changes that DO warrant a release:
+- Bug fixes in `lib/`
+- New features or API changes
+- Updates to runtime dependencies in the gemspec (e.g., bumping `faraday` constraint)
+
+## Key Dependencies
+
+- `faraday` (~> 2.0) - HTTP client
+- `faraday-retry` (~> 2.0) - Retry middleware

CLAUDE.md

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+@AGENTS.md