feat: add marketing tools registry for agent discovery

Create centralized tools/ directory with REGISTRY.md index and 29
integration guides covering analytics, SEO, CRM, payments, referral,
email, ads, automation, and commerce platforms.

Each guide includes API endpoints, authentication, common operations,
and links to relevant skills. Updated AGENTS.md and key skills
(referral-program, analytics-tracking, email-sequence, paid-ads)
with tool integration references.

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

tools/integrations/webflow.md

@@ -0,0 +1,198 @@
+# Webflow
+
+Visual web design and CMS platform for marketing sites.
+
+## Capabilities
+
+| Integration | Available | Notes |
+|-------------|-----------|-------|
+| API | ✓ | REST API for sites, CMS, forms |
+| MCP | - | Not available |
+| CLI | ✓ | Webflow CLI for devlink and apps |
+| SDK | ✓ | Official SDK for Node.js |
+
+## Authentication
+
+- **Type**: API Token (Site token or OAuth)
+- **Header**: `Authorization: Bearer {api_token}`
+- **Get token**: Site Settings > Integrations > API Access
+
+## Common Agent Operations
+
+### List sites
+
+```bash
+GET https://api.webflow.com/v2/sites
+
+Authorization: Bearer {api_token}
+```
+
+### Get site
+
+```bash
+GET https://api.webflow.com/v2/sites/{site_id}
+
+Authorization: Bearer {api_token}
+```
+
+### List collections
+
+```bash
+GET https://api.webflow.com/v2/sites/{site_id}/collections
+
+Authorization: Bearer {api_token}
+```
+
+### List collection items
+
+```bash
+GET https://api.webflow.com/v2/collections/{collection_id}/items
+
+Authorization: Bearer {api_token}
+```
+
+### Get collection item
+
+```bash
+GET https://api.webflow.com/v2/collections/{collection_id}/items/{item_id}
+
+Authorization: Bearer {api_token}
+```
+
+### Create collection item
+
+```bash
+POST https://api.webflow.com/v2/collections/{collection_id}/items
+
+Authorization: Bearer {api_token}
+
+{
+  "fieldData": {
+    "name": "Item Name",
+    "slug": "item-name",
+    "custom-field": "value"
+  }
+}
+```
+
+### Update collection item
+
+```bash
+PATCH https://api.webflow.com/v2/collections/{collection_id}/items/{item_id}
+
+Authorization: Bearer {api_token}
+
+{
+  "fieldData": {
+    "custom-field": "new value"
+  }
+}
+```
+
+### Publish collection items
+
+```bash
+POST https://api.webflow.com/v2/collections/{collection_id}/items/publish
+
+Authorization: Bearer {api_token}
+
+{
+  "itemIds": ["item_id_1", "item_id_2"]
+}
+```
+
+### List form submissions
+
+```bash
+GET https://api.webflow.com/v2/sites/{site_id}/forms/{form_id}/submissions
+
+Authorization: Bearer {api_token}
+```
+
+### Publish site
+
+```bash
+POST https://api.webflow.com/v2/sites/{site_id}/publish
+
+Authorization: Bearer {api_token}
+
+{
+  "publishToWebflowSubdomain": true,
+  "publishToCustomDomains": true
+}
+```
+
+## Node.js SDK
+
+```javascript
+const Webflow = require('webflow-api');
+
+const webflow = new Webflow({ token: 'api_token' });
+
+// List sites
+const sites = await webflow.sites.list();
+
+// Get collection items
+const items = await webflow.collections.items.listItems(collectionId);
+
+// Create item
+const item = await webflow.collections.items.createItem(collectionId, {
+  fieldData: {
+    name: 'New Item',
+    slug: 'new-item'
+  }
+});
+```
+
+## CLI Commands
+
+```bash
+# Install
+npm install -g @webflow/webflow-cli
+
+# Login
+webflow login
+
+# Initialize devlink
+webflow devlink init
+
+# Sync components
+webflow devlink sync
+```
+
+## CMS Structure
+
+- **Collections** - Content types (like blog posts, team members)
+- **Items** - Individual entries in a collection
+- **Fields** - Data fields on items
+
+## Common Field Types
+
+- `PlainText` - Simple text
+- `RichText` - Formatted content
+- `Image` - Image upload
+- `Link` - URL or page reference
+- `Reference` - Link to another collection
+- `Multi-Reference` - Multiple collection links
+- `Switch` - Boolean toggle
+- `Number` - Numeric value
+- `Date` - Date/time
+
+## When to Use
+
+- Marketing site CMS management
+- Blog/content publishing
+- Form submission handling
+- Automated content updates
+- Programmatic SEO pages
+
+## Rate Limits
+
+- 60 requests/minute (general)
+- 10 requests/minute (publishing)
+
+## Relevant Skills
+
+- programmatic-seo
+- content-strategy
+- page-cro