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>

cursor-hooks/QUICKSTART.md

@@ -1,11 +1,15 @@
 # Quick Start: Claude-Mem + Cursor Integration
 
+> **Give your Cursor AI persistent memory in under 5 minutes**
+
 ## What This Does
 
 Connects claude-mem to Cursor so that:
-- Agent actions (MCP tools, shell commands, file edits) are automatically saved
-- Context from past sessions is automatically injected via `.cursor/rules/`
-- Sessions are summarized for future reference
+- **Agent actions** (MCP tools, shell commands, file edits) are automatically saved
+- **Context from past sessions** is automatically injected via `.cursor/rules/`
+- **Sessions are summarized** for future reference
+
+Your AI stops forgetting. It remembers the patterns, decisions, and context from previous sessions.
 
 ## Don't Have Claude Code?