Ported from rega's snipgate and mbxcheck probes (card GATE-EVERY-PUBLISHED-SNIPPET-DRAWS-A-MAP). Two scripts so the keyless arm never waits on a token: check:snippets-draw pastes each production embed.script and requires a MapLibre map to draw (a hooked instance with its style loaded via a setter trap on the engine global, a sized canvas, tiles 2xx, no failure note, 0 page errors); check:snippets-draw:mapbox does the same over embed.scriptMapbox with only the token filled from MAP_TOKEN, NOT MEASURED without one and never printing it. Composites that open on a list (regions-mfe, upg-100-mfe) are pressed to their map view under the settle rule first, since a hidden pane still draws a canvas. The browser slot is checked before any server starts, and the tree server is spawned --exit-with-parent. Registered and declared on demand until rega's first run; it joins verify-browser-all after.
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