docs(cursor): Add marketing copy and value proposition messaging

Add compelling marketing copy to Cursor documentation with consistent
messaging across all files:

- README.md: Added headline, "Why Claude-Mem?" section, quick install
- STANDALONE-SETUP.md: Added tagline and enhanced value props
- QUICKSTART.md: Added tagline and benefit statement
- docs/public/cursor/index.mdx: Added card grid highlighting benefits

Key messaging themes:
- "Persistent AI Memory for Cursor"
- "Your AI stops forgetting"
- "Free tier options available"
- "Works with or without Claude Code"

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

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

docs/public/cursor/index.mdx

@@ -1,11 +1,28 @@
 ---
 title: "Cursor Integration"
-description: "Use Claude-Mem's persistent memory in Cursor IDE - with free provider options"
+description: "Persistent AI memory for Cursor IDE - free tier options available"
 ---
 
 # Cursor Integration
 
-Claude-mem brings persistent AI memory to Cursor IDE. Your coding sessions remember context across restarts, helping the AI understand your codebase deeply over time.
+> **Your AI stops forgetting. Give Cursor persistent memory.**
+
+Every Cursor session starts fresh - your AI doesn't remember what it worked on yesterday. Claude-mem changes that. Your agent builds cumulative knowledge about your codebase, decisions, and patterns over time.
+
+<CardGroup cols={2}>
+  <Card title="Free to Start" icon="dollar-sign">
+    Works with Gemini's free tier (1500 req/day) - no subscription required
+  </Card>
+  <Card title="Automatic Capture" icon="bolt">
+    MCP tools, shell commands, and file edits logged without effort
+  </Card>
+  <Card title="Smart Context" icon="brain">
+    Relevant history injected into every chat session
+  </Card>
+  <Card title="Works Everywhere" icon="check">
+    With or without Claude Code subscription
+  </Card>
+</CardGroup>
 
 <Info>
 **No Claude Code subscription required.** Use Gemini (free tier) or OpenRouter as your AI provider.