Add guided onboarding flow for first-time users

[nandanadileep]

Problem

First-time users get a generic greeting and have no guidance on how to use the skill or how to personalize it. Memory stays empty unless users discover SetContextIntent on their own.

Proposed Solution

• Detect first-time users (no DynamoDB record exists)
• Run a short guided setup: "Hi! I'm Kimi. What's your name? ... What do you do? ... Where are you based?"
• Store each answer directly into structured user context
• On subsequent launches, greet users by name

Acceptance Criteria

• First-time users go through a 2–3 question onboarding flow
• Answers are saved as structured memory facts
• Returning users are greeted by name
• Onboarding can be re-triggered: "reset my profile"