Function create_and_sign_encrypted_message 

pub fn create_and_sign_encrypted_message(
    bridge: &mut SignalBridge,
    session_id: &str,
    encrypted_content: &str,
    timestamp: u64,
    project_version: &str,
) -> Result<String, Box<dyn Error>>

Creates and signs a Nostr encrypted message event

Arguments

• bridge - Signal bridge instance
• session_id - Recipient’s session identifier
• encrypted_content - Hex-encoded encrypted content
• timestamp - Unix timestamp
• project_version - Protocol version string

Returns

Signed Nostr event JSON