Fix key-alarm IM delivery blocked by DSH session sink.

Run session and WhatsApp/IM sinks in parallel so a failing or slow sticky session no longer skips proactive IM delivery (0.1.34).

Co-authored-by: Cursor <cursoragent@cursor.com>

test/alarm-dispatch.test.mjs

@@ -0,0 +1,67 @@
+import assert from 'node:assert/strict'
+import { test } from 'node:test'
+
+import { dispatchAlarmToSinks } from '../src/netx/alarm-dispatch.ts'
+
+test('dispatchAlarmToSinks still delivers IM when DSH session rejects', async () => {
+  let imCalls = 0
+  const warnings = []
+  const ctx = {
+    logger: {
+      warn: (...args) => { warnings.push(args.map(String).join(' ')) },
+      info() {},
+    },
+  }
+  const results = await dispatchAlarmToSinks(
+    ctx,
+    {
+      action: 'inserted',
+      rule_label: 'Power Down',
+      alarm_key: 'k1',
+      ne: { host_name: 'PE1' },
+    },
+    {
+      deliverDsh: true,
+      deliverIm: true,
+      imTargets: [{ botId: 'bot', targetId: 'tgt' }],
+      lang: 'zh',
+    },
+    {
+      toSession: async () => {
+        throw new Error('sticky session exploded')
+      },
+      toIm: async () => {
+        imCalls += 1
+      },
+    },
+  )
+  assert.equal(imCalls, 1)
+  assert.equal(results.length, 2)
+  assert.equal(results[0].status, 'rejected')
+  assert.equal(results[1].status, 'fulfilled')
+  assert.ok(warnings.some((line) => line.includes('sink failed')))
+})
+
+test('dispatchAlarmToSinks skips session job when deliverDsh is false', async () => {
+  let sessionCalls = 0
+  let imCalls = 0
+  const ctx = { logger: { warn() {}, info() {} } }
+  const results = await dispatchAlarmToSinks(
+    ctx,
+    { action: 'inserted', alarm_key: 'k1' },
+    {
+      deliverDsh: false,
+      deliverIm: true,
+      imTargets: [{ botId: 'bot', targetId: 'tgt' }],
+      lang: 'zh',
+    },
+    {
+      toSession: async () => { sessionCalls += 1 },
+      toIm: async () => { imCalls += 1 },
+    },
+  )
+  assert.equal(sessionCalls, 0)
+  assert.equal(imCalls, 1)
+  assert.equal(results.length, 1)
+  assert.equal(results[0].status, 'fulfilled')
+})