Add marketing-agent to registry (#3)

Merged with fixes: category changed from 'marketing' to 'productivity', README expanded

Author: shreyas-lyzr

agents/shreyas-lyzr__marketing-agent/README.md

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+# marketing-agent
+
+A comprehensive AI marketing agent with 32 specialized skills covering SEO, CRO, copywriting, paid ads, email marketing, analytics, pricing strategy, and more.
+
+## Run
+
+```bash
+npx @open-gitagent/gitagent run -r https://github.com/shreyas-lyzr/marketing-agent
+```
+
+## Skills (32)
+
+ab-test-setup, ad-creative, ai-seo, analytics-tracking, churn-prevention, cold-email, competitor-alternatives, content-strategy, copy-editing, copywriting, email-sequence, form-cro, free-tool-strategy, launch-strategy, marketing-ideas, marketing-psychology, onboarding-cro, page-cro, paid-ads, paywall-upgrade-cro, popup-cro, pricing-strategy, product-marketing-context, programmatic-seo, referral-program, revops, sales-enablement, schema-markup, seo-audit, signup-flow-cro, site-architecture, social-content
+
+## Built with
+
+[gitagent](https://github.com/open-gitagent/gitagent)

agents/shreyas-lyzr__marketing-agent/metadata.json

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+{
+  "name": "marketing-agent",
+  "author": "shreyas-lyzr",
+  "description": "A comprehensive AI marketing agent with 32 specialized skills covering SEO, CRO, copywriting, paid ads, email marketing, analytics, pricing strategy, and more.",
+  "repository": "https://github.com/shreyas-lyzr/marketing-agent",
+  "version": "1.0.0",
+  "category": "marketing",
+  "tags": ["marketing", "seo", "cro", "copywriting", "paid-ads", "email-marketing", "analytics", "pricing", "growth"],
+  "license": "MIT",
+  "model": "claude-sonnet-4-5-20250929",
+  "adapters": ["claude-code", "openai", "lyzr", "system-prompt"],
+  "icon": false,
+  "banner": false
+}