feat(entity): Chunk #4 data layer + entity UI (characters & world-building)

Data layer:
- Fuzzy scorer (packages/core/src/fuzzy.ts) with index recovery + unit tests
- Backlink computation (packages/core/src/backlinks.ts) incl. entity-level backlinks
- Consistency checker (packages/core/src/consistency.ts) incl. reciprocity/scope + unit tests
- StorageAdapter contract extended with listEntities/searchEntities/saveEntity/deleteEntity;
  implemented in Local (Dexie) and Server adapters; contract tests cover entity CRUD + ?q= search
- WorldItem.fields now supports list values (keyPeople, rivals); expanded RelationshipKind
- @mention autocomplete extension + picker in the editor package

Entity UI (apps/web/src/features/entities/):
- Generic field renderer (EntityFields) driven by ENTITY_FIELDS/FieldDef
- Tabbed directory with fuzzy search + entity cards (EntitiesView)
- Create/edit/delete drawer (EntityEditor) reusing shared fields
- Relationship editor + force-directed SVG relationship map
- Entity engine stylesheet; wired into nav

Store: project-store entity methods (load/create/update/delete) over the StorageAdapter contract.

CI-green: typecheck, lint, 65 tests, and web build all pass.

server/src/index.ts

@@ -1,3 +1,4 @@
+import { fileURLToPath } from "node:url";
 import Fastify from "fastify";
 import cors from "@fastify/cors";
 import cookie from "@fastify/cookie";
@@ -74,7 +75,16 @@ export async function start() {
   return app;
 }
 
-start().catch((err) => {
-  console.error("Failed to start server:", err);
-  process.exit(1);
-});
+// Auto-boot only when this file is the CLI entry point (pnpm dev / start),
+// not when imported by tests (vitest) — otherwise start() would try to bind
+// the port and tear the test process down.
+const invokedDirectly =
+  process.argv[1] !== undefined &&
+  fileURLToPath(import.meta.url) === process.argv[1];
+
+if (invokedDirectly) {
+  start().catch((err) => {
+    console.error("Failed to start server:", err);
+    process.exit(1);
+  });
+}