Replace the two ad-hoc as-cast loose readers in src/logic/store.ts with
effect Schema decode-at-boundary. New src/boundary/schema/SessionInfo.ts
defines SessionInfoPatchSchema + CatalogSchema (decodeUnknownOption),
mirroring GatewayEvent.ts. readInfoPatch + setCatalog now decode once and
build the typed patch/Catalog from the result (Option.none → empty
patch / catalog unset, never crashes). Wire field names verified against
tui_gateway/server.py. Removed the now-dead readOptBool helper. Tests
extended for nested-usage vs top-level context fallback, malformed/partial
payloads, and a garbage catalog.