Add core inspector, CLI, and formatter

- Inspector extracts callbacks and validators from any AR model,
  resolves source locations, and filters Rails internals
- CLI: `whetrails inspect <ModelName>` boots Rails and renders chain
- Formatter produces clean lifecycle-ordered terminal output
- Order model added as development fixture

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/models/order.rb

@@ -0,0 +1,31 @@
+class Order < ApplicationRecord
+  validates :status, presence: true
+  validates :total, numericality: { greater_than: 0 }, if: :paid?
+
+  before_validation :normalize_status
+  before_save :calculate_total
+  after_create :send_confirmation
+  after_commit :notify_warehouse
+
+  private
+
+  def normalize_status
+    self.status = status&.strip&.downcase
+  end
+
+  def calculate_total
+    # placeholder
+  end
+
+  def send_confirmation
+    # placeholder
+  end
+
+  def notify_warehouse
+    # placeholder
+  end
+
+  def paid?
+    status == "paid"
+  end
+end