Add Coverage Atlas — 50-state CMS coverage policy scanner (healthcare enterprise demo)

[giaphutran12]

Note: this is a first version / skeleton. The healthcare case is owned by @meteor (delivery Sunday) — this exists because the machinery was shared with the finance demo (#263). Mengzhe: use it as a base, cherry-pick, or ignore entirely — your call, no toes intended.

What it is

Coverage Atlas scans Medicaid coverage policy across all 51 jurisdictions and makes the comparison and the delta the product: a tile map per condition (GLP-1 for obesity, CGMs), a plain-language change feed, and an SC-vs-TX verbatim prior-auth criteria diff.

• Sweep all 51 states now: one tracker fetch + a live TinyFish search per state, SSE-streamed (~25s), tiles repaint as each state lands; hysteresis rule kills classifier flapping so a reported change is a real alert
• Check again now: a stealth agent re-reads the official source for one state on the spot and updates the record — in testing it corrected our own database live (NC: covered → covered with limits)
• Every record carries effective date, source document link, and a scanner "last verified" timestamp; statuses never color-alone

TinyFish usage

fetch for trackers, search for per-state corroboration, stealth agent + US proxy for verification (state sites 403 plain fetchers — live-tested). Statuses are live-scraped at seed time, never hand-typed. Snippet in the README per CONTRIBUTING.

Raw Postgres (Supabase session pooler), Tailwind v4 CSS-first tokens, design locked from a Claude Design handoff (docs/DESIGN.md).

🤖 Generated with Claude Code

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