Post text content to Binance Square with API key authentication and error handling.

• Supports pure text posts with hashtag support; constructs shareable post URLs on success
• Requires X-Square-OpenAPI-Key header authentication; agent prompts for missing credentials before attempting posts
• Handles 20+ error codes including sensitive content detection, daily post limits, identity verification requirements, and account bans
• Agent optimizes raw user input for readability and requests confirmation before posting; never displays full API keys in output