refactor: one kind of edge — replace connections with highlights
Remove the separate connections/relationships layer from strata analysis.
All edges are now network.cosmik.connection records. The analysis flags
existing edges as "hot" (semantically significant) via a highlights array
of AT URIs. Frontend renders hot edges with a star badge and accent border.
Lexicon changes:
- Remove #connection def and token defs (supports, contradicts, etc.)
- Remove connections from structuredAnalysis
- Add highlights (at-uri[]) to structuredAnalysis
Analysis changes:
- Replace findConnections with findHotEdges — scores edges by
vault/carry overlap and connection type, returns top AT URIs
- Remove validateConnections (no longer needed)
- Remove Connection interface
Worker changes:
- Replace relationships flattening with highlights passthrough
Frontend changes:
- Remove Relationships section
- Hot edges get .hot-edge class, star badge, accent border
- Edges header shows "N hot" count
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Co-Authored-By: Letta Code <noreply@letta.com>