Edge rows are now <a> links to semble.so/at/<record-uri>.
Removed vertex list — only edges shown. Removed "Strata" h2.

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Layout: summary + graph at top, synthesis below, then themes,
relationships, tensions, open questions, and full node/edge lists
at the bottom.

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On rebuild, compute the new lexmin-hash ID for each old island
and carry forward its summary and strata data to the new row.

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Shape: 16 hex chars (e.g. "a3f2c8b91e4d7a05"). Stable when
vertices are added, opaque, short enough for URLs and DB keys.

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Island ID is now the alphabetically smallest URI in the connected
component, not a hash of all vertices. This keeps the ID stable when
new vertices are added to the island.

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