Add Demo Mode — full consciousness audit without API key

Users can now experience the complete audit flow instantly:
- "Run Demo Audit" button at bottom of setup page
- Pre-recorded responses for all 22 probes (realistic AI outputs)
- Animated progress with 300-700ms delays per probe
- Full results: gauge, theory breakdown, stats, indicators, probe list
- Works for all depth levels (Quick/Standard/Full)

Zero friction: Landing page → ENTER → Demo → Full results in seconds.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: MukundaKatta