Loki Mode

Zero-friction adoption: offline taste path + shareable receipt badge

• loki demo --offline (and loki tour): a zero-key, zero-spend, no-network
  taste path. It replays a bundled real Evidence Receipt and prints its honest
  headline + facts in under a second, so a newcomer can see what Loki produces
  WITHOUT installing a provider CLI, logging in, or spending anything. It is
  clearly framed as a SAMPLE/replay (never presented as a verdict on the user's
  own code) and never renders a green/verified signal unless the bundled
  receipt's real headline is VERIFIED (it is VERIFIED WITH GAPS, shown as such).
• loki proof share receipt badge: after sharing, prints a copy-paste
  "Verified by Loki" markdown badge for READMEs/PRs/posts. The badge color and
  text derive ONLY from the receipt's honest headline: green only for VERIFIED,
  a distinct badge for VERIFIED WITH GAPS, red for NOT VERIFIED, and no badge at
  all when there is no verifiable headline (no fake-green, no new network egress).
• README leads with loki quickstart: the guided one-command first build is
  now the headline path; loki init + loki start remain as the explicit path.