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/hubspot.md

@@ -0,0 +1,178 @@
+# HubSpot
+
+CRM platform for marketing, sales, and customer service.
+
+## Capabilities
+
+| Integration | Available | Notes |
+|-------------|-----------|-------|
+| API | ✓ | REST API for CRM, Marketing, Sales |
+| MCP | - | Not available |
+| CLI | ✓ | `hs` CLI for local development |
+| SDK | ✓ | Official client libraries |
+
+## Authentication
+
+- **Type**: Private App Token or OAuth 2.0
+- **Header**: `Authorization: Bearer {access_token}`
+- **Get token**: Settings > Integrations > Private Apps
+
+## Common Agent Operations
+
+### Get contacts
+
+```bash
+GET https://api.hubapi.com/crm/v3/objects/contacts?limit=10
+
+Authorization: Bearer {access_token}
+```
+
+### Search contacts
+
+```bash
+POST https://api.hubapi.com/crm/v3/objects/contacts/search
+
+{
+  "filterGroups": [{
+    "filters": [{
+      "propertyName": "email",
+      "operator": "EQ",
+      "value": "user@example.com"
+    }]
+  }]
+}
+```
+
+### Create contact
+
+```bash
+POST https://api.hubapi.com/crm/v3/objects/contacts
+
+{
+  "properties": {
+    "email": "user@example.com",
+    "firstname": "John",
+    "lastname": "Doe",
+    "company": "Example Inc"
+  }
+}
+```
+
+### Update contact
+
+```bash
+PATCH https://api.hubapi.com/crm/v3/objects/contacts/{contact_id}
+
+{
+  "properties": {
+    "lifecyclestage": "customer"
+  }
+}
+```
+
+### Get deals
+
+```bash
+GET https://api.hubapi.com/crm/v3/objects/deals?limit=10&properties=dealname,amount,dealstage
+
+Authorization: Bearer {access_token}
+```
+
+### Create deal
+
+```bash
+POST https://api.hubapi.com/crm/v3/objects/deals
+
+{
+  "properties": {
+    "dealname": "New Deal",
+    "amount": "10000",
+    "dealstage": "appointmentscheduled",
+    "pipeline": "default"
+  }
+}
+```
+
+### Associate contact with deal
+
+```bash
+PUT https://api.hubapi.com/crm/v3/objects/deals/{deal_id}/associations/contacts/{contact_id}/deal_to_contact
+```
+
+### Get form submissions
+
+```bash
+GET https://api.hubapi.com/form-integrations/v1/submissions/forms/{form_guid}
+
+Authorization: Bearer {access_token}
+```
+
+### Get marketing emails
+
+```bash
+GET https://api.hubapi.com/marketing/v3/emails?limit=10
+
+Authorization: Bearer {access_token}
+```
+
+## CLI Commands
+
+```bash
+# Install
+npm install -g @hubspot/cli
+
+# Initialize project
+hs init
+
+# Upload files
+hs upload src dest
+
+# Watch for changes
+hs watch src dest
+
+# List portals
+hs accounts list
+```
+
+## Key Objects
+
+- **Contacts** - People in CRM
+- **Companies** - Organizations
+- **Deals** - Sales opportunities
+- **Tickets** - Support tickets
+- **Products** - Items for sale
+- **Line Items** - Deal line items
+
+## Common Properties
+
+### Contact Properties
+- `email` - Email address
+- `firstname`, `lastname` - Name
+- `lifecyclestage` - Funnel stage
+- `hs_lead_status` - Lead status
+
+### Deal Properties
+- `dealname` - Deal name
+- `amount` - Deal value
+- `dealstage` - Pipeline stage
+- `closedate` - Expected close
+
+## When to Use
+
+- Managing contacts and leads
+- Tracking sales deals
+- Marketing automation
+- Form submissions
+- Email campaigns
+- Customer service tickets
+
+## Rate Limits
+
+- 100 requests per 10 seconds
+- Higher limits on enterprise plans
+
+## Relevant Skills
+
+- email-sequence
+- analytics-tracking
+- referral-program