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

Author: dduugg

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to AI coding agents when working with code in this repository.
+
+## What this project is
+
+`code_manifest` is a Ruby gem that fetches files by glob patterns and generates a digest of those files. It is used to produce stable manifests of file sets for caching and change-detection purposes.
+
+## Commands
+
+```bash
+bundle install
+
+# Run all tests (RSpec)
+bundle exec rspec
+
+# Run a single spec file
+bundle exec rspec spec/path/to/spec.rb
+```
+
+## Architecture
+
+- `lib/code_manifest.rb` — public API; accepts glob patterns and returns matched files plus a digest
+- `lib/code_manifest/` — internal helpers for glob resolution and hashing
+- `spec/` — RSpec tests; `spec/fixtures/` holds sample file trees

CLAUDE.md

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+@AGENTS.md