Normalized vault activity events

Returns a deterministic event timeline for one EVK, Euler Earn, or Securitize vault. eventType filters the normalized type; rawType preserves the indexed source name. Coverage reflects the categories applicable to the requested vault type. Unsupported or incomplete indexed sources are reported in meta.coverage. Any positive safe-integer chain ID is accepted; chains without V3 Activity indexing return HTTP 200 with an empty timeline and meta.coverage.status: unsupported. Structurally unavailable sources report unsupported coverage; transient projection failures retain indexed events and report partial coverage. EVK governance activity includes events from an EulerRouter used as the vault's immutable oracle only when that router is recorded as deployed by EulerRouterFactory. Routers outside that factory registry are not decoded or projected. Governance actor and before/after enrichment, underlying-asset metadata and valuation, and swap asset/vault mapping can be unavailable. Missing normalized values stay absent, source fields remain in payload, and coverage continues to describe indexed event-family availability. Missing valuation is explicit and never synthesized as zero.