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>

db/migrate/20260608161002_create_orders.rb

@@ -0,0 +1,10 @@
+class CreateOrders < ActiveRecord::Migration[8.1]
+  def change
+    create_table :orders do |t|
+      t.string :status
+      t.decimal :total
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -0,0 +1,20 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema[8.1].define(version: 2026_06_08_161002) do
+  create_table "orders", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.string "status"
+    t.decimal "total"
+    t.datetime "updated_at", null: false
+  end
+end