Conversational onboarding and fix showContextModal bug

[bokelley]

Summary

• Fix missing showContextModal function in admin-users.html that was causing "Can't find variable" errors when adding insights
• Update Addie's system prompt to use conversational onboarding style instead of survey-style questions
• Update suggested prompts to be more casual and natural
• Add migration for new insight types and conversational welcome goal

Changes

Bug Fix

• Added missing showContextModal() wrapper function that was being called but didn't exist

Conversational Onboarding

Instead of survey-style questions like "What are your 2026 plans?" or "What's your role?", Addie now:

• Opens with "Hey! Glad you're here - what brings you to AgenticAdvertising.org?"
• Follows up contextually based on the answer
• Infers structured insights naturally from conversation rather than asking directly

New Suggested Prompts

Updated prompts to sound like things a person would actually say:

• "What brings you here?" instead of "What can you help me with?"
• "What is this anyway?" instead of "Learn about AdCP"
• "Help me build something" instead of "Get started building"
• "Find my people" instead of "Find a working group"

Migration (140_conversational_onboarding.sql)

• New insight types: initial_interest, team_context, perspective_preference
• New "Welcome - What Brings You" outreach goal with keyword-based outcomes
• Lowered priority of old survey-style goals

Test plan

• Migration applies successfully
• TypeScript compiles without errors
• All tests pass
• Manually verify showContextModal works in admin-users.html
• Verify suggested prompts appear correctly in Slack

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