feat(ee): turbopuffer ai vector search driver (#2402)

* feat(ai): add AI_VECTOR_DRIVER and turbopuffer configuration

* feat(ai): carry workspace and target space ids on vector lifecycle events

* feat(ai): add vector driver interface and turbopuffer request helpers

* feat(ai): add pgvector driver behind the vector driver interface

* refactor(ai): route vector reads and writes through the vector driver

* feat(ai): add turbopuffer vector driver

* feat(ai): rebuild turbopuffer namespaces when the embedding model changes

* feat(ai): warm the vector namespace cache on session start

* fix(ai): harden turbopuffer misconfiguration and reset failure paths

* fix(ai): collapse blank-line runs in extracted page text

* fix(ai): skip full re-embed when ai search is re-enabled within the delete grace window

* sync

* fix(ai): store real embedding dimensions instead of serialized vector length

* fix(ai): filter search hits by the page's current space at query time

* fix(ai): retry the page moved-to-space vector patch job

* sync

* feat(ai): pre-warm the vector namespace

* fix(ai): pass AI_VECTOR_DRIVER through the client build config

apps/server/src/common/helpers/text.utils.spec.ts

@@ -0,0 +1,14 @@
+import { collapseBlankLines } from './text.utils';
+
+describe('collapseBlankLines', () => {
+  it.each([
+    ['a\n\n\n\nb', 'a\n\nb'],
+    ['a\n\nb', 'a\n\nb'],
+    ['a\nb', 'a\nb'],
+    ['\n\n\n\na\n\n\n', '\n\na\n\n'],
+    ['no newlines', 'no newlines'],
+    ['', ''],
+  ])('collapses %j to %j', (input, expected) => {
+    expect(collapseBlankLines(input)).toBe(expected);
+  });
+});