swapit — household toxics inventory + swap engine

What this skill is

swapit turns a vague worry ("there's probably a lot of plastic and BPA in my house") into a concrete, prioritized, trackable plan. It is stateful: your household inventory lives on disk and persists across sessions. It is local-first: zero paid services, nothing leaves your device unless you explicitly opt into the (M3) commons.

One pass produces:

1. An inventory of the items you own, each tagged with its generic item-class.
2. A risk score per item that reflects actual exposure — a scratched non-stick pan used daily at high heat ranks far above an unopened plastic bin in the garage.
3. A ranked "swap-first" list — the 5% of changes that cut the most exposure.
4. Swap tracking — chosen alternative, procurement status, checklist, bookmarks.
5. A shareable HTML report (and, in M2, a live dashboard at swapit serve).

The three realms (and the privacy invariant)