feat: add 23 new CLI tools and integration guides

New tools across 13 categories:
- Email/Newsletter: beehiiv, klaviyo, postmark, brevo, activecampaign
- Data Enrichment: clearbit, apollo
- CRO/Testing: hotjar, optimizely
- Analytics: plausible
- Scheduling: calendly, savvycal
- Forms: typeform
- Messaging: intercom
- Social: buffer
- Video: wistia
- Payments: paddle
- Affiliate: partnerstack
- Reviews: trustpilot, g2
- Push: onesignal
- Webinar: demio, livestorm

Each tool includes a zero-dependency CLI and integration guide.
Registry and CLI README updated with all new entries.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/integrations/beehiiv.md

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+# Beehiiv
+
+Newsletter platform with subscriber management, post publishing, automations, and referral programs.
+
+## Capabilities
+
+| Integration | Available | Notes |
+|-------------|-----------|-------|
+| API | ✓ | REST API v2 for publications, subscriptions, posts, segments |
+| MCP | - | Not available |
+| CLI | ✓ | [beehiiv.js](../clis/beehiiv.js) |
+| SDK | - | No official SDK; OpenAPI spec available for codegen |
+
+## Authentication
+
+- **Type**: Bearer Token
+- **Header**: `Authorization: Bearer {api_key}`
+- **Get key**: Settings > API under Workspace Settings at https://app.beehiiv.com
+- **Note**: API key is only shown once on creation; copy and store it immediately
+
+## Common Agent Operations
+
+### List publications
+
+```bash
+GET https://api.beehiiv.com/v2/publications
+```
+
+### Get publication details
+
+```bash
+GET https://api.beehiiv.com/v2/publications/{publicationId}
+```
+
+### List subscriptions
+
+```bash
+GET https://api.beehiiv.com/v2/publications/{publicationId}/subscriptions?limit=10&status=active
+
+# Filter by email
+GET https://api.beehiiv.com/v2/publications/{publicationId}/subscriptions?email=user@example.com
+```
+
+### Create subscription
+
+```bash
+POST https://api.beehiiv.com/v2/publications/{publicationId}/subscriptions
+
+{
+  "email": "user@example.com",
+  "reactivate_existing": false,
+  "send_welcome_email": true,
+  "utm_source": "api",
+  "tier": "free"
+}
+```
+
+### Update subscription
+
+```bash
+PUT https://api.beehiiv.com/v2/publications/{publicationId}/subscriptions/{subscriptionId}
+
+{
+  "tier": "premium"
+}
+```
+
+### Delete subscription
+
+```bash
+DELETE https://api.beehiiv.com/v2/publications/{publicationId}/subscriptions/{subscriptionId}
+```
+
+### List posts
+
+```bash
+GET https://api.beehiiv.com/v2/publications/{publicationId}/posts?limit=10&status=confirmed
+```
+
+### Create post (Enterprise only)
+
+```bash
+POST https://api.beehiiv.com/v2/publications/{publicationId}/posts
+
+{
+  "title": "Weekly Update",
+  "subtitle": "What happened this week",
+  "content": "<p>Hello subscribers...</p>",
+  "status": "draft"
+}
+```
+
+### List segments
+
+```bash
+GET https://api.beehiiv.com/v2/publications/{publicationId}/segments
+```
+
+### List automations
+
+```bash
+GET https://api.beehiiv.com/v2/publications/{publicationId}/automations
+```
+
+### Get referral program
+
+```bash
+GET https://api.beehiiv.com/v2/publications/{publicationId}/referral_program
+```
+
+## API Pattern
+
+All endpoints are scoped to a publication. The publication ID is a required path parameter for most operations. Responses use cursor-based pagination with a `cursor` parameter for fetching subsequent pages.
+
+## Key Metrics
+
+### Subscription Fields
+- `status` - validating, invalid, pending, active, inactive
+- `tier` - free or premium
+- `created` - Subscription creation timestamp
+- `utm_source`, `utm_medium`, `utm_campaign` - Acquisition tracking
+- `referral_code` - Unique referral code for subscriber
+
+### Post Fields
+- `status` - draft, confirmed (scheduled), archived
+- `publish_date` - When the post was/will be published
+- `stats` - Open rate, click rate, subscriber count (with expand)
+
+## Parameters
+
+### Common Query Parameters
+- `limit` - Results per page (1-100, default 10)
+- `cursor` - Cursor for next page of results
+- `expand[]` - Include additional data: stats, custom_fields, referrals
+- `status` - Filter by subscription/post status
+- `tier` - Filter by subscription tier (free, premium)
+
+## When to Use
+
+- Managing newsletter subscribers programmatically
+- Syncing subscribers from external signup forms or landing pages
+- Building referral program integrations
+- Automating post creation and publishing workflows
+- Tracking subscriber growth and engagement metrics
+
+## Rate Limits
+
+- API rate limits apply per API key
+- Use cursor-based pagination for efficient data retrieval
+- Batch operations not available; iterate with individual requests
+
+## Relevant Skills
+
+- email-sequence
+- newsletter-growth
+- referral-program
+- content-strategy