resolveVertexMeta was doing 14 sequential D1 queries (cards+citations,
chunked at 50). Now builds all statements upfront and runs them in a
single db.batch() call. Also removed ensureContrailReady from getIslands
entirely — it only needs D1.

940ms → 320ms cold, 200ms warm.

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- Canvas height 200px → 320px (was cramming 301 nodes vertically)
- Remove hardcoded width/height HTML attrs — constructor sizes via
getBoundingClientRect + devicePixelRatio
- Repulsion force 300 → 500 for better spread
- Warmup ticks 120 → 200 for settled layout

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Explore page fetches ?summary=true — skips vertexMeta (244KB saved)
and trims edges to source/target/connectionType. Full data loads
on demand when viewing an island detail. Also skips contrail init
in summary mode for faster cold starts.

523KB → 216KB, 1.2s → 230ms cold, 90ms warm.

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Landing page only needs a json_extract query, not contrail schema
init. Cold start went from ~450ms to ~170ms.

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Landing page only needs id, lexmin, title — extract those via
json_extract instead of pulling the full record (117KB each).

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