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Matysh
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The owner's kitchen-living room is L-shaped, and interiorPoint() only promises 'somewhere inside' — the button sat near the seam, visibly off-centre. poleOfInaccessibility() (largest inscribed circle, grid search plus one refinement pass) puts it in the middle of the widest open space: the slab of an L, the exact centre of a rectangle or square. Cached per poly array in a WeakMap — the memoized model keeps the arrays stable, so the search runs once per geometry, not per render. Unit: square -> centre; thick-slab L -> mid-slab, always inside.
Synthetic demo home
A fully fictional house (plans, devices, states) used for README screenshots, the demo GIF and headless smoke tests — so no real home data ever appears in public materials.
srv/demo.html— self-contained host page:<ha-icon>/<ha-card>stubs and a fakehass(registries, states,callWS,callService, floors).srv/assets/— generated plan SVGs andicons.js(node demo/gen_icons.mjs, needs the repo's devDependencies). The card bundle is copied fromdist/:cp dist/houseplan-card.js demo/srv/assets/.serve.mjs— playwright launcher (route interception, no web server).smoke_*.mjs— feature smoke tests; run with a Chromium installed viaPLAYWRIGHT_BROWSERS_PATH=<dir> npx playwright install chromium-headless-shell.
Note for sandboxed sessions: /tmp does not survive; this directory is the
persistent home of the harness (docs/DEVELOPMENT.md has the LD_LIBRARY_PATH recipe).