Prompt Suggestion System (Experimental)

What: A new system that predicts and suggests the user's next prompt based on conversation context.

Details:

• Generates 3-8 word suggestions for natural follow-ups (e.g., "run the tests", "now fix the linting errors")
• Only triggers for main REPL thread queries
• Includes telemetry for suggestion display and acceptance tracking
• Evidence: Functions at lines ~409868-409929, telemetry event tengu_prompt_suggestion_shown