refactor(cli)!: rename all skills and agents to consistent ce- prefix (#503)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

plugins/compound-engineering/skills/ce-andrew-kane-gem-writer/SKILL.md

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+---
+name: ce-andrew-kane-gem-writer
+description: This skill should be used when writing Ruby gems following Andrew Kane's proven patterns and philosophy. It applies when creating new Ruby gems, refactoring existing gems, designing gem APIs, or when clean, minimal, production-ready Ruby library code is needed. Triggers on requests like "create a gem", "write a Ruby library", "design a gem API", or mentions of Andrew Kane's style.
+---
+
+# Andrew Kane Gem Writer
+
+Write Ruby gems following Andrew Kane's battle-tested patterns from 100+ gems with 374M+ downloads (Searchkick, PgHero, Chartkick, Strong Migrations, Lockbox, Ahoy, Blazer, Groupdate, Neighbor, Blind Index).
+
+## Core Philosophy
+
+**Simplicity over cleverness.** Zero or minimal dependencies. Explicit code over metaprogramming. Rails integration without Rails coupling. Every pattern serves production use cases.
+
+## Entry Point Structure
+
+Every gem follows this exact pattern in `lib/gemname.rb`:
+
+```ruby
+# 1. Dependencies (stdlib preferred)
+require "forwardable"
+
+# 2. Internal modules
+require_relative "gemname/model"
+require_relative "gemname/version"
+
+# 3. Conditional Rails (CRITICAL - never require Rails directly)
+require_relative "gemname/railtie" if defined?(Rails)
+
+# 4. Module with config and errors
+module GemName
+  class Error < StandardError; end
+  class InvalidConfigError < Error; end
+
+  class << self
+    attr_accessor :timeout, :logger
+    attr_writer :client
+  end
+
+  self.timeout = 10  # Defaults set immediately
+end
+```
+
+## Class Macro DSL Pattern
+
+The signature Kane pattern—single method call configures everything:
+
+```ruby
+# Usage
+class Product < ApplicationRecord
+  searchkick word_start: [:name]
+end
+
+# Implementation
+module GemName
+  module Model
+    def gemname(**options)
+      unknown = options.keys - KNOWN_KEYWORDS
+      raise ArgumentError, "unknown keywords: #{unknown.join(", ")}" if unknown.any?
+
+      mod = Module.new
+      mod.module_eval do
+        define_method :some_method do
+          # implementation
+        end unless method_defined?(:some_method)
+      end
+      include mod
+
+      class_eval do
+        cattr_reader :gemname_options, instance_reader: false
+        class_variable_set :@@gemname_options, options.dup
+      end
+    end
+  end
+end
+```
+
+## Rails Integration
+
+**Always use `ActiveSupport.on_load`—never require Rails gems directly:**
+
+```ruby
+# WRONG
+require "active_record"
+ActiveRecord::Base.include(MyGem::Model)
+
+# CORRECT
+ActiveSupport.on_load(:active_record) do
+  extend GemName::Model
+end
+
+# Use prepend for behavior modification
+ActiveSupport.on_load(:active_record) do
+  ActiveRecord::Migration.prepend(GemName::Migration)
+end
+```
+
+## Configuration Pattern
+
+Use `class << self` with `attr_accessor`, not Configuration objects:
+
+```ruby
+module GemName
+  class << self
+    attr_accessor :timeout, :logger
+    attr_writer :master_key
+  end
+
+  def self.master_key
+    @master_key ||= ENV["GEMNAME_MASTER_KEY"]
+  end
+
+  self.timeout = 10
+  self.logger = nil
+end
+```
+
+## Error Handling
+
+Simple hierarchy with informative messages:
+
+```ruby
+module GemName
+  class Error < StandardError; end
+  class ConfigError < Error; end
+  class ValidationError < Error; end
+end
+
+# Validate early with ArgumentError
+def initialize(key:)
+  raise ArgumentError, "Key must be 32 bytes" unless key&.bytesize == 32
+end
+```
+
+## Testing (Minitest Only)
+
+```ruby
+# test/test_helper.rb
+require "bundler/setup"
+Bundler.require(:default)
+require "minitest/autorun"
+require "minitest/pride"
+
+# test/model_test.rb
+class ModelTest < Minitest::Test
+  def test_basic_functionality
+    assert_equal expected, actual
+  end
+end
+```
+
+## Gemspec Pattern
+
+Zero runtime dependencies when possible:
+
+```ruby
+Gem::Specification.new do |spec|
+  spec.name = "gemname"
+  spec.version = GemName::VERSION
+  spec.required_ruby_version = ">= 3.1"
+  spec.files = Dir["*.{md,txt}", "{lib}/**/*"]
+  spec.require_path = "lib"
+  # NO add_dependency lines - dev deps go in Gemfile
+end
+```
+
+## Anti-Patterns to Avoid
+
+- `method_missing` (use `define_method` instead)
+- Configuration objects (use class accessors)
+- `@@class_variables` (use `class << self`)
+- Requiring Rails gems directly
+- Many runtime dependencies
+- Committing Gemfile.lock in gems
+- RSpec (use Minitest)
+- Heavy DSLs (prefer explicit Ruby)
+
+## Reference Files
+
+For deeper patterns, see:
+- `references/module-organization.md` - Directory layouts, method decomposition
+- `references/rails-integration.md` - Railtie, Engine, on_load patterns
+- `references/database-adapters.md` - Multi-database support patterns
+- `references/testing-patterns.md` - Multi-version testing, CI setup
+- `references/resources.md` - Links to Kane's repos and articles