test: cover features since 053a9c0d + repair test tooling

Add ~330 tests across server (Jest), client (Vitest), editor-ext (Vitest)
and packages/mcp (node:test) for the gitmost features added since
053a9c0d: AI chat, AI agent roles, public-share assistant, MCP per-user
auth, HTML embed, page templates/embed, realtime tree, tree
expand/collapse, and the AI-settings UI.

Test-tooling fixes (prerequisite, were silently hiding coverage):
- Repair 3 page-template specs broken by the 11-arg TransclusionService
  constructor; they never compiled, so template access-control / content
  -leak / unsync-strip coverage was fictitious.
- Build @docmost/editor-ext before server tests via a `pretest` hook;
  the stale dist omitted the new HtmlEmbed/PageEmbed exports (TS2305).
- Let jest resolve the .tsx email templates: add `tsx` to
  moduleFileExtensions and widen the ts-jest transform to (t|j)sx?.

Behaviour-preserving "extract pure core" refactors that the tests drive:
- server: resolveShareAssistantRequest + uiMessageTextLength
  (public-share controller), decideBasicGate + mapAuthResultToResponse
  (mcp), buildErrorAssistantRecord (ai-chat), jsonbObject export (roles).
- client: render-raw-html + shouldExecute/canEdit, decide-embed-state,
  page-embed picker utils, tree-socket reducers, open/close branch maps,
  isEndpointConfigured/resolveKeyField; buildTreeWithChildren now treats
  a permission-trimmed orphan as a root instead of crashing.

Deferred (need a test DB or HTTP harness, documented in the specs):
repo-level Postgres integration tests and the public-share XFF E2E.
Pre-existing DI/lib0-ESM suite failures are untouched and out of scope.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/client/src/features/editor/components/html-embed/render-raw-html.ts

@@ -0,0 +1,73 @@
+/**
+ * Pure DOM helpers for the HTML embed node view. Kept out of the React
+ * component so the script re-creation/execution mechanism and the execution/
+ * edit policy can be unit-tested against a bare jsdom container with no
+ * Tiptap/Mantine providers.
+ */
+
+/**
+ * Inject raw HTML (including <script> tags) into `container`, executing any
+ * scripts.
+ *
+ * Setting `innerHTML` does NOT run inline or external <script> tags the browser
+ * parses that way: the HTML spec marks scripts inserted via innerHTML as
+ * "already started" so they never execute. To get the tracker/analytics
+ * use-case working we walk the freshly-parsed scripts and replace each with a
+ * brand-new <script> element copying its attributes and inline code. A
+ * programmatically created+inserted <script> DOES execute, so this restores
+ * normal script behaviour in the wiki origin (Variant C).
+ */
+export function renderRawHtml(container: HTMLElement, source: string): void {
+  // Clear any previous render (re-render on source change).
+  container.innerHTML = "";
+  if (!source) return;
+
+  container.innerHTML = source;
+
+  // Use the container's own document so the helper works against any document
+  // (the live page or a standalone jsdom instance in tests), not just the
+  // ambient global `document`.
+  const doc = container.ownerDocument;
+  const scripts = Array.from(container.querySelectorAll("script"));
+  for (const oldScript of scripts) {
+    const newScript = doc.createElement("script");
+    // Copy every attribute (src, type, async, defer, data-*, etc.).
+    for (const attr of Array.from(oldScript.attributes)) {
+      newScript.setAttribute(attr.name, attr.value);
+    }
+    // Copy inline code.
+    newScript.text = oldScript.textContent ?? "";
+    // Replacing the node in place triggers execution.
+    oldScript.parentNode?.replaceChild(newScript, oldScript);
+  }
+}
+
+/**
+ * Execution policy split by editor mode:
+ *  - READ-ONLY / public-share view: the SERVER already decided whether to
+ *    include the embed (it strips htmlEmbed from shared content when the
+ *    workspace toggle is OFF). An anonymous viewer has no workspace and thus
+ *    reads `featureEnabled` as false, so we must NOT gate execution on it here
+ *    — we execute exactly the `source` the server chose to serve.
+ *  - EDITABLE editor (admin authoring): keep gating on the per-workspace toggle
+ *    so an admin sees the inert placeholder when the feature is OFF.
+ */
+export function shouldExecute(
+  isEditable: boolean,
+  featureEnabled: boolean,
+): boolean {
+  return !isEditable || featureEnabled;
+}
+
+/**
+ * The edit affordance is only meaningful in edit mode, is restricted to admins
+ * (the server strips the node for non-admins anyway), and is offered only when
+ * the workspace feature toggle is ON.
+ */
+export function canEdit(
+  isEditable: boolean,
+  isAdmin: boolean,
+  featureEnabled: boolean,
+): boolean {
+  return isEditable && isAdmin && featureEnabled;
+}