Add AGENTS.md and CLAUDE.md for AI coding agent guidance

AGENTS.md

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+This file provides guidance to AI coding agents when working with code in this repository.
+
+## What this project is
+
+`packs-specification` is a low-dependency Ruby gem that provides production-safe querying of [packs](https://github.com/rubyatscale/packs) configuration. It exposes `Packs.all` and `Packs.for_file` without pulling in development-only tooling.
+
+## Commands
+
+```bash
+bundle install
+
+# Run all tests (RSpec)
+bundle exec rspec
+
+# Run a single spec file
+bundle exec rspec spec/path/to/spec.rb
+
+# Type checking (Sorbet)
+bundle exec srb tc
+```
+
+## Architecture
+
+- `lib/packs-specification.rb` — public API: `Packs.all`, `Packs.for_file`
+- `lib/packs/` — `Pack` struct with fields from `package.yml`; configuration reader that locates packs via glob patterns
+- `spec/` — RSpec tests

CLAUDE.md

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+@AGENTS.md