feat: expand demo to 5 scenes — sovereign choice + merchant

Scene 3: Agent routes around bad vendor using community trust
scores from NIP-85 attestations synced via Nostr relays.

Scene 4: Agent opens L402 gateway, earns 8 sats from 3 other
agents querying its vendor intelligence.

Scene 5: Protocol summary with feature overview.

Cold intro added for non-Bitcoin viewers. Tool count updated
to 22.

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

Author: singularityjason