Add SimplyStored::HasAttachment — Paperclip replacement for CouchDB

- New module lib/simply_stored/has_attachment.rb
  Drop-in replacement using MiniMagick for thumbnail generation.
  Same file paths as Paperclip — zero migration of existing files.
  Auto-declares CouchDB properties for attachment metadata.
  Proxy object mimics Paperclip::Attachment API for view compat.
- Wired into lib/cmtool.rb
- Added TODO migration comments to Image, News, Quote models

app/models/cmtool/image.rb

@@ -2,6 +2,10 @@ module Cmtool
   class Image
     include SimplyStored::Couch
     include Paperclip::Glue
+    # TODO: Replace Paperclip with SimplyStored::HasAttachment
+    # 1. Change `include Paperclip::Glue` to `include SimplyStored::HasAttachment`
+    # 2. Replace `has_attached_file :file, styles: {...}` with `has_attachment :file, styles: {...}`
+    # 3. Replace `validates_attachment` with standard Rails validations
 
     property :file_file_name
     property :file_content_type

app/models/cmtool/news.rb

@@ -2,6 +2,9 @@ module Cmtool
   class News
     include SimplyStored::Couch
     include Paperclip::Glue
+    # TODO: Replace Paperclip with SimplyStored::HasAttachment
+    # 1. Change `include Paperclip::Glue` to `include SimplyStored::HasAttachment`
+    # 2. Replace `has_attached_file :image, styles: {...}` with `has_attachment :image, styles: {...}`
 
     property :title
     property :active, type: :boolean, default: true

app/models/cmtool/quote.rb

@@ -2,6 +2,9 @@ module Cmtool
   class Quote
     include SimplyStored::Couch
     include Paperclip::Glue
+    # TODO: Replace Paperclip with SimplyStored::HasAttachment
+    # 1. Change `include Paperclip::Glue` to `include SimplyStored::HasAttachment`
+    # 2. Replace `has_attached_file :image, styles: {...}` with `has_attachment :image, styles: {...}`
 
     property :owner
     property :function