Fix bizMonitor tool results failing DSH lossless JSON (strip undefined holes).

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

test/json-safe.test.mjs

@@ -0,0 +1,40 @@
+/**
+ * Lossless JSON helpers for DSH tool results.
+ */
+
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { omitUndefined, toLosslessJson } from '../src/netx/json-safe.ts'
+
+test('omitUndefined drops undefined keys but keeps null/false/0', () => {
+  assert.deepEqual(
+    omitUndefined({ a: 1, b: undefined, c: null, d: false, e: 0 }),
+    { a: 1, c: null, d: false, e: 0 },
+  )
+})
+
+test('toLosslessJson strips undefined holes (listBizMonitors-style payload)', () => {
+  const raw = {
+    ok: true,
+    data: {
+      kind: 'projects',
+      projects: [{ id: 'p1', name: 'demo' }],
+      tasks: undefined,
+      next: 'go',
+    },
+  }
+  const safe = toLosslessJson(raw)
+  assert.equal(safe.ok, true)
+  const data = safe.data
+  assert.ok(data && typeof data === 'object' && !Array.isArray(data))
+  assert.equal(Object.hasOwn(data, 'tasks'), false)
+  assert.deepEqual(data.projects, [{ id: 'p1', name: 'demo' }])
+})
+
+test('toLosslessJson keeps failure envelopes serializable', () => {
+  const safe = toLosslessJson({ ok: false, error: 'x', detail: undefined })
+  assert.equal(safe.ok, false)
+  assert.equal(safe.error, 'x')
+  assert.equal(Object.hasOwn(safe, 'detail'), false)
+})