A holistic entry point for cold readers of the repo. Aggregates content
from the existing docs site (docs/index.md, docs/design/index.md,
state-machine §3 + §9) — no new design claims, just navigation and
status reporting.

Sections:
- Hero block with shields.io status badges and three-layer framing
  (research / design / implementation)
- Status snapshot table mirroring docs/index.md (research passes,
  design synthesis, Q1-Q10 status, §9 implementation steps)
- Documentation table mapping reader question → which design doc
- Canister architecture: §3 Mermaid embedded directly + critical-
  constraint paragraph (treasury is sole fund holder)
- Implementation roadmap: 6 rows mapping each §9 step to current
  status + bead ID for tracking
- Getting started: just serve for docs, cargo build for canisters
- Tech stack with version pins matching workspace deps
- Contributing: where design changes / impl work / research
  additions land
- License: Apache-2.0 per Cargo.toml; flags missing LICENSE file
  as known follow-up

Refs frontier-dao-4y7.