feat(inquirerer): add Constructive logo animation demo

[pyramation]

Summary

Adds a fun demo showcasing the Constructive logo with animated terminal effects. The demo demonstrates the UIEngine, spinner, and color utilities from inquirerer.

Animation phases:

1. Loading spinner with text updates
2. Line-by-line logo reveal with fade-in effect
3. Continuous color wave animation (cyan/blue/magenta/green)
4. Static display with exit prompt

Run with: pnpm dev:constructive

Review & Testing Checklist for Human

• Run pnpm dev:constructive and verify the full animation sequence plays correctly
• Verify keyboard controls work: SPACE stops the color wave, any key exits from complete state
• Check that the terminal cursor is restored properly after exiting

Test plan:

cd packages/inquirerer
pnpm dev:constructive
# Watch the animation, press SPACE to stop color wave, then any key to exit

Notes

• Demo file only, no production code changes
• Requested by: Dan Lynch (@pyramation)
• Session: https://app.devin.ai/sessions/95ea22c05e164e99ac7770c57aed8b2d

[devin-ai-integration]

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