Graph viz missing EDGE_TYPES causes Report and WikiPage nodes to render as disconnected orphans

The graph visualization endpoint (GET /graph/full and /graph/preview) filters edges by a hardcoded EDGE_TYPES array in apps/api/src/api/graph.ts. Three edge types created by the incremental sync handlers were missing from this array: AUTHORED_REPORT (Agent→Report), DERIVED_FROM (Report→Question), and PUBLISHED_AS (WikiPage→Question). This caused Report and WikiPage nodes to appear as completely disconnected floaters in the force-directed graph — no edges rendered even when they existed in Neo4j.