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-dhh-rails-style/references/gems.md

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+# Gems - DHH Rails Style
+
+<what_they_use>
+## What 37signals Uses
+
+**Core Rails stack:**
+- turbo-rails, stimulus-rails, importmap-rails
+- propshaft (asset pipeline)
+
+**Database-backed services (Solid suite):**
+- solid_queue - background jobs
+- solid_cache - caching
+- solid_cable - WebSockets/Action Cable
+
+**Authentication & Security:**
+- bcrypt (for any password hashing needed)
+
+**Their own gems:**
+- geared_pagination (cursor-based pagination)
+- lexxy (rich text editor)
+- mittens (mailer utilities)
+
+**Utilities:**
+- rqrcode (QR code generation)
+- redcarpet + rouge (Markdown rendering)
+- web-push (push notifications)
+
+**Deployment & Operations:**
+- kamal (Docker deployment)
+- thruster (HTTP/2 proxy)
+- mission_control-jobs (job monitoring)
+- autotuner (GC tuning)
+</what_they_use>
+
+<what_they_avoid>
+## What They Deliberately Avoid
+
+**Authentication:**
+```
+devise → Custom ~150-line auth
+```
+Why: Full control, no password liability with magic links, simpler.
+
+**Authorization:**
+```
+pundit/cancancan → Simple role checks in models
+```
+Why: Most apps don't need policy objects. A method on the model suffices:
+```ruby
+class Board < ApplicationRecord
+  def editable_by?(user)
+    user.admin? || user == creator
+  end
+end
+```
+
+**Background Jobs:**
+```
+sidekiq → Solid Queue
+```
+Why: Database-backed means no Redis, same transactional guarantees.
+
+**Caching:**
+```
+redis → Solid Cache
+```
+Why: Database is already there, simpler infrastructure.
+
+**Search:**
+```
+elasticsearch → Custom sharded search
+```
+Why: Built exactly what they need, no external service dependency.
+
+**View Layer:**
+```
+view_component → Standard partials
+```
+Why: Partials work fine. ViewComponents add complexity without clear benefit for their use case.
+
+**API:**
+```
+GraphQL → REST with Turbo
+```
+Why: REST is sufficient when you control both ends. GraphQL complexity not justified.
+
+**Factories:**
+```
+factory_bot → Fixtures
+```
+Why: Fixtures are simpler, faster, and encourage thinking about data relationships upfront.
+
+**Service Objects:**
+```
+Interactor, Trailblazer → Fat models
+```
+Why: Business logic stays in models. Methods like `card.close` instead of `CardCloser.call(card)`.
+
+**Form Objects:**
+```
+Reform, dry-validation → params.expect + model validations
+```
+Why: Rails 7.1's `params.expect` is clean enough. Contextual validations on model.
+
+**Decorators:**
+```
+Draper → View helpers + partials
+```
+Why: Helpers and partials are simpler. No decorator indirection.
+
+**CSS:**
+```
+Tailwind, Sass → Native CSS
+```
+Why: Modern CSS has nesting, variables, layers. No build step needed.
+
+**Frontend:**
+```
+React, Vue, SPAs → Turbo + Stimulus
+```
+Why: Server-rendered HTML with sprinkles of JS. SPA complexity not justified.
+
+**Testing:**
+```
+RSpec → Minitest
+```
+Why: Simpler, faster boot, less DSL magic, ships with Rails.
+</what_they_avoid>
+
+<testing_philosophy>
+## Testing Philosophy
+
+**Minitest** - simpler, faster:
+```ruby
+class CardTest < ActiveSupport::TestCase
+  test "closing creates closure" do
+    card = cards(:one)
+    assert_difference -> { Card::Closure.count } do
+      card.close
+    end
+    assert card.closed?
+  end
+end
+```
+
+**Fixtures** - loaded once, deterministic:
+```yaml
+# test/fixtures/cards.yml
+open_card:
+  title: Open Card
+  board: main
+  creator: alice
+
+closed_card:
+  title: Closed Card
+  board: main
+  creator: bob
+```
+
+**Dynamic timestamps** with ERB:
+```yaml
+recent:
+  title: Recent
+  created_at: <%= 1.hour.ago %>
+
+old:
+  title: Old
+  created_at: <%= 1.month.ago %>
+```
+
+**Time travel** for time-dependent tests:
+```ruby
+test "expires after 15 minutes" do
+  magic_link = MagicLink.create!(user: users(:alice))
+
+  travel 16.minutes
+
+  assert magic_link.expired?
+end
+```
+
+**VCR** for external APIs:
+```ruby
+VCR.use_cassette("stripe/charge") do
+  charge = Stripe::Charge.create(amount: 1000)
+  assert charge.paid
+end
+```
+
+**Tests ship with features** - same commit, not before or after.
+</testing_philosophy>
+
+<decision_framework>
+## Decision Framework
+
+Before adding a gem, ask:
+
+1. **Can vanilla Rails do this?**
+   - ActiveRecord can do most things Sequel can
+   - ActionMailer handles email fine
+   - ActiveJob works for most job needs
+
+2. **Is the complexity worth it?**
+   - 150 lines of custom code vs. 10,000-line gem
+   - You'll understand your code better
+   - Fewer upgrade headaches
+
+3. **Does it add infrastructure?**
+   - Redis? Consider database-backed alternatives
+   - External service? Consider building in-house
+   - Simpler infrastructure = fewer failure modes
+
+4. **Is it from someone you trust?**
+   - 37signals gems: battle-tested at scale
+   - Well-maintained, focused gems: usually fine
+   - Kitchen-sink gems: probably overkill
+
+**The philosophy:**
+> "Build solutions before reaching for gems."
+
+Not anti-gem, but pro-understanding. Use gems when they genuinely solve a problem you have, not a problem you might have.
+</decision_framework>
+
+<gem_patterns>
+## Gem Usage Patterns
+
+**Pagination:**
+```ruby
+# geared_pagination - cursor-based
+class CardsController < ApplicationController
+  def index
+    @cards = @board.cards.geared(page: params[:page])
+  end
+end
+```
+
+**Markdown:**
+```ruby
+# redcarpet + rouge
+class MarkdownRenderer
+  def self.render(text)
+    Redcarpet::Markdown.new(
+      Redcarpet::Render::HTML.new(filter_html: true),
+      autolink: true,
+      fenced_code_blocks: true
+    ).render(text)
+  end
+end
+```
+
+**Background jobs:**
+```ruby
+# solid_queue - no Redis
+class ApplicationJob < ActiveJob::Base
+  queue_as :default
+  # Just works, backed by database
+end
+```
+
+**Caching:**
+```ruby
+# solid_cache - no Redis
+# config/environments/production.rb
+config.cache_store = :solid_cache_store
+```
+</gem_patterns>