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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Lexicon: connections field now holds objects {uri, source, target,
connectionType, note} instead of bare AT URIs. The graph renders
straight from the record — no chunked D1 queries needed.

Backfilled both existing records via PDS putRecord.

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- Lexicon: add connections field (array of AT URIs)
- getIslands: reconstruct island from stored connections in chunks of 50
- Backfill existing records with 341 connection URIs each
- Landing page loads summaries, frontend fetches full data via API

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- Island interface: vertices, edges, vertexMeta now optional
- Card renderer shows title preview for summaries, graph for full data
- summarizeIsland checks title before vertices
- Fixed landing page to query D1 directly instead of internal fetch

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