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/mapping.ts

@@ -183,7 +183,7 @@ export function toEntity(r: EntityRow): Entity {
       bio: f.bio ?? "",
       appearance: f.appearance ?? "",
       voice: f.voice ?? "",
-      relationships: f.relationships ?? "",
+      relationships: typeof f.relationships === "string" ? JSON.parse(f.relationships) : (f.relationships ?? []),
       arc: f.arc ?? "",
       status: f.status ?? "active",
       tags: f.tags ?? [],
@@ -251,6 +251,21 @@ export function entityToRow(e: Entity): Omit<EntityRow, "created_at" | "updated_
 }
 
 // ---- helpers ----
+/** Concatenate every human-readable field of an entity into one searchable string. */
+export function entitySearchText(e: Entity): string {
+  if ("fields" in e) {
+    const parts = [e.name, e.kind];
+    for (const v of Object.values(e.fields)) if (typeof v === "string") parts.push(v);
+    return parts.join(" ");
+  }
+  if ("body" in e) {
+    return [e.body, ...e.tags].join(" ");
+  }
+  const c = e as Character;
+  const relText = (c.relationships ?? []).map((r) => `${r.targetId} ${r.kind} ${r.note}`).join(" ");
+  return [c.name, c.role, c.bio, c.appearance, c.voice, relText, c.arc, c.status, ...c.tags].join(" ");
+}
+
 /** Count words in a ProseMirror doc (text nodes only). */
 export function wordCount(doc: unknown): number {
   let count = 0;