feat(gtm-manager): Rename to ourdigital-gtm-manager and add dataLayer injector

BREAKING CHANGE: Renamed from 13-gtm-audit to 13-ourdigital-gtm-manager

New Features:
- DataLayerInjector class for generating custom HTML tags
- Support for 20+ GA4 event types (ecommerce, forms, video, engagement)
- Subcommand structure: audit and inject modes
- Preset tag generation (ecommerce, engagement, all)
- DOM scraping option for dynamic value extraction
- Generate tags from audit report findings
- Korean payment method support (카카오페이, 네이버페이, 토스)

CLI Changes:
- `python gtm_manager.py audit --url ...` for auditing
- `python gtm_manager.py inject --preset ecommerce` for tag generation
- `python gtm_manager.py inject --event purchase --event add_to_cart`
- `python gtm_manager.py inject --from-audit report.json`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ourdigital-custom-skills/13-ourdigital-gtm-manager/docs/ga4_events.md

@@ -0,0 +1,177 @@
+# GA4 Recommended Events Reference
+
+## Automatically Collected Events
+Events GA4 collects without configuration:
+- `first_visit` - First time user visits
+- `session_start` - Session begins
+- `page_view` - Page loads (enhanced measurement)
+- `scroll` - 90% scroll depth
+- `click` - Outbound link clicks
+- `file_download` - File download clicks
+- `video_start`, `video_progress`, `video_complete` - YouTube embeds
+
+## E-commerce Events (Required Parameters)
+
+### view_item_list
+```javascript
+{
+  event: "view_item_list",
+  ecommerce: {
+    item_list_id: "related_products",
+    item_list_name: "Related Products",
+    items: [{
+      item_id: "SKU_12345",      // required
+      item_name: "Product Name", // required
+      price: 29.99,
+      quantity: 1
+    }]
+  }
+}
+```
+
+### view_item
+```javascript
+{
+  event: "view_item",
+  ecommerce: {
+    currency: "USD",
+    value: 29.99,
+    items: [{
+      item_id: "SKU_12345",      // required
+      item_name: "Product Name", // required
+      price: 29.99,
+      quantity: 1
+    }]
+  }
+}
+```
+
+### add_to_cart
+```javascript
+{
+  event: "add_to_cart",
+  ecommerce: {
+    currency: "USD",
+    value: 29.99,
+    items: [{
+      item_id: "SKU_12345",      // required
+      item_name: "Product Name", // required
+      price: 29.99,
+      quantity: 1
+    }]
+  }
+}
+```
+
+### begin_checkout
+```javascript
+{
+  event: "begin_checkout",
+  ecommerce: {
+    currency: "USD",
+    value: 99.99,
+    coupon: "SUMMER_SALE",
+    items: [...]
+  }
+}
+```
+
+### add_payment_info
+```javascript
+{
+  event: "add_payment_info",
+  ecommerce: {
+    currency: "USD",
+    value: 99.99,
+    payment_type: "credit_card",
+    items: [...]
+  }
+}
+```
+
+### purchase
+```javascript
+{
+  event: "purchase",
+  ecommerce: {
+    transaction_id: "T12345",   // required, must be unique
+    value: 99.99,               // required
+    currency: "USD",            // required
+    tax: 4.99,
+    shipping: 5.99,
+    coupon: "SUMMER_SALE",
+    items: [{
+      item_id: "SKU_12345",     // required
+      item_name: "Product Name",// required
+      price: 29.99,
+      quantity: 2
+    }]
+  }
+}
+```
+
+## Lead Generation Events
+
+### generate_lead
+```javascript
+{
+  event: "generate_lead",
+  currency: "USD",
+  value: 100  // estimated lead value
+}
+```
+
+### sign_up
+```javascript
+{
+  event: "sign_up",
+  method: "email"  // or "google", "facebook", etc.
+}
+```
+
+### login
+```javascript
+{
+  event: "login",
+  method: "email"
+}
+```
+
+## Engagement Events
+
+### search
+```javascript
+{
+  event: "search",
+  search_term: "blue shoes"
+}
+```
+
+### share
+```javascript
+{
+  event: "share",
+  method: "twitter",
+  content_type: "article",
+  item_id: "article_123"
+}
+```
+
+## Parameter Validation Rules
+
+| Parameter | Type | Max Length | Notes |
+|-----------|------|------------|-------|
+| event name | string | 40 chars | No spaces, alphanumeric + underscore |
+| item_id | string | 100 chars | Required for e-commerce |
+| item_name | string | 100 chars | Required for e-commerce |
+| currency | string | 3 chars | ISO 4217 format (USD, KRW, etc.) |
+| transaction_id | string | 100 chars | Must be unique per transaction |
+| value | number | - | Numeric, no currency symbols |
+
+## Common Validation Errors
+
+1. **Missing required params**: `item_id` or `item_name` not in items array
+2. **Wrong data type**: `value` as string instead of number
+3. **Duplicate transaction_id**: Same ID used for multiple purchases
+4. **Empty items array**: E-commerce event with no items
+5. **Invalid currency**: Currency code not in ISO 4217 format