Promote AgentCompany-New to the repository root and retire the old app

The legacy application - its src, tests, landing site, promo assets, docs,
release tooling, CI workflows, and root configs - leaves the tree; it stays
reachable in history. Everything under AgentCompany-New moves up unchanged:
same package name, so the production userData/database path is untouched,
and e2e/build scripts already resolved paths relative to the project. The
developer cred.txt stays gitignored at its new location. Full verify:ci
passes from the new root.

src/main/services/knowledge-service.ts

@@ -0,0 +1,36 @@
+import type { DatabaseSync } from "node:sqlite";
+import type { CreateKnowledgeEntryInput, DeleteKnowledgeEntryInput } from "../../shared/commands";
+import { createId } from "../../shared/ids";
+import { AuditService } from "./audit-service";
+
+export class KnowledgeService {
+  private readonly audit: AuditService;
+
+  constructor(private readonly db: DatabaseSync) {
+    this.audit = new AuditService(db);
+  }
+
+  create(input: CreateKnowledgeEntryInput): string {
+    const id = createId("kne");
+    const now = new Date().toISOString();
+    this.db.prepare(`
+      insert into knowledge_entries(id, org_id, topic, category, content, importance, source_type, source_id, created_at, updated_at)
+      values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(id, input.orgId, input.topic.trim(), input.category, input.content, input.importance, input.sourceType, input.sourceId, now, now);
+    this.audit.record({
+      orgId: input.orgId,
+      entityType: "knowledge_entry",
+      entityId: id,
+      actorType: "system",
+      actorId: null,
+      action: "created",
+      payload: { topic: input.topic.trim(), category: input.category },
+    });
+    return id;
+  }
+
+  delete(input: DeleteKnowledgeEntryInput): void {
+    const result = this.db.prepare("delete from knowledge_entries where id = ? and org_id = ?").run(input.entryId, input.orgId);
+    if (result.changes === 0) throw new Error("Knowledge entry was not found.");
+  }
+}