v1.0.1 — README marketing redesign

[1.0.1] — 2026-05-17

Docs-only release. README repositioned for marketing impact on the
GitHub repo page: centered hero stack, 3-beat sub-tagline, naming-gesture
excerpt above the fold, v1.0.0 banner relocated to a "What's in v1.0.0"
callout. No code changes; the v1.0.0 surface is unchanged.

Changed

• README hero now uses a centered stack with upgraded badges + nav row
  (matches the OSS spine used by astro / prisma / bun / vercel-ai).
• Three-beat sub-tagline under the hero packs install + in-chat +
  naming claims into one italicized line.
• New "Install (60 seconds)" section above the fold pairs the three-line
  install with a four-line naming-gesture dialog excerpt (cross-links
  to the full "Your First Scan" section below).
• v1.0.0 banner blockquote demoted to a "What's in v1.0.0" callout
  further down the README.
• Stub-command caveat and legacy onboarding warnings consolidated into
  the "What's Not There Yet" section so honest-list discipline lives
  in one place.