feat(news): index news packages and research persistent events

Extract reusable literal keywords once per source revision, assign complete news packages to long-lived events, and research all event members with immutable evidence and references.

Add additive research storage, vocabulary snapshots, the two-stage workspace, isolated acceptance coverage, and a paused rollout with an initial fixed 50-news production trial.

web/tests/news-research.test.ts

@@ -0,0 +1,41 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import * as vue from "vue"
+import { moduleLoader } from "./module-loader.ts"
+
+test("event archives and fact packages use separate API contracts", async () => {
+  const calls: { url: string }[] = []
+  const load = moduleLoader({ "@/http/axios": { request: async (config: { url: string }) => calls.push(config) } })
+  const api = load("@@/apis/risk")
+  await api.listRiskEventsApi({ importance: 3, hours: 72 })
+  await api.getNewsEventApi(9)
+  await api.getRiskPackageApi(4)
+  await api.listNewsPackagesApi(12, 2)
+  assert.deepEqual(calls.map(c => c.url), ["/risk/events", "/risk/events/9", "/risk/packages/4", "/risk/news/12/packages"])
+})
+
+test("switching event details discards previous event and session responses", async () => {
+  const first = Promise.withResolvers<any>()
+  const second = Promise.withResolvers<any>()
+  const user = vue.reactive({ sessionVersion: 1 })
+  const load = moduleLoader({
+    "@/common/apis/risk": { getNewsEventApi: (id: number) => id === 1 ? first.promise : second.promise },
+    "@/pinia/stores/user": { useUserStore: () => user },
+    "@@/utils/text": { formatTime: (s: string) => s }
+  }, { ...vue, onMounted() {}, onBeforeUnmount() {}, setInterval() {}, clearInterval() {} })
+  const page = load("@/pages/home/components/EventResearch.vue").default.setup({}, { expose() {} })
+  const a = page.open(1)
+  const b = page.open(2)
+  second.resolve({ id: 2, title: "Second event", packages: [{ id: 4, fact: "Original fact" }] })
+  await b
+  first.resolve({ id: 1, title: "Old event" })
+  await a
+  assert.equal(page.detail.value.id, 2)
+  assert.equal(page.detail.value.packages[0].fact, "Original fact")
+  const pending = page.open(1)
+  user.sessionVersion++
+  await vue.nextTick()
+  await pending
+  assert.equal(page.detail.value, null)
+  assert.equal(page.opened.value, false)
+})