rename(phase 1): CapaKraken → Nexus across code, UI, docs, CI

- @capakraken/* → @nexus/* across 12 packages (root + 11 workspaces),
  1551 import lines migrated via codemod
- User-visible brand strings renamed (emails, page titles, PWA
  manifest, mobile header, MFA backup-codes header, tooltips, signin
  page, invite page, weekly digest, install prompt)
- TOTP issuer "CapaKraken" → "Nexus" (existing secrets still valid;
  re-enrollment relabels them in users' authenticator apps)
- Function rename: assertCapaKrakenDbTarget → assertNexusDbTarget
- LocalStorage migration shim in apps/web/src/app/layout.tsx copies
  capakraken_* → nexus_* on first load (guarded by nexus_migrated_v1
  sentinel; runs once per browser, then never again)
- Service-worker cache name capakraken-v2 → nexus-v2 with one-time
  caches.delete('capakraken-v2') from the same shim
- Email-domain fixtures @capakraken.{dev,app} → @nexus.{dev,app} in
  seed data, e2e specs, SMTP default fallback
- Dockerfile.dev / Dockerfile.prod / all .github/workflows/*.yml
  pnpm --filter @capakraken/* → @nexus/*
- README, CLAUDE.md, LEARNINGS.md, all docs/*.md, .env.example,
  tooling/deploy/.env.production.example brand sweep

Phase 1 deliberately leaves untouched (handled in Phase 3 cutover):
- PostgreSQL DB name "capakraken" and POSTGRES_USER "capakraken"
- Volume names capakraken_pgdata etc.
- Compose project name "capakraken" / "capakraken-prod"
- db-target-guard default expectedDatabase
- env-var CAPAKRAKEN_EXPECTED_DB_NAME
- Container DNS names in docker-compose.ci.yml

Quality gates green: pnpm typecheck (7/7), pnpm test:unit (7/7),
pnpm lint (0 errors), check:exports/imports/architecture all pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/api/src/__tests__/assistant-tools-demand-fill.test.ts

@@ -1,8 +1,8 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
-import { PermissionKey, SystemRole } from "@capakraken/shared";
+import { PermissionKey, SystemRole } from "@nexus/shared";
 
-vi.mock("@capakraken/application", async (importOriginal) => {
-  const actual = await importOriginal<typeof import("@capakraken/application")>();
+vi.mock("@nexus/application", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@nexus/application")>();
   return {
     ...actual,
     approveEstimateVersion: vi.fn(),
@@ -120,7 +120,9 @@ describe("assistant demand fill tool", () => {
         create: auditCreate,
       },
     };
-    const transaction = vi.fn().mockImplementation(async (callback: (inner: typeof tx) => Promise<unknown>) => callback(tx));
+    const transaction = vi
+      .fn()
+      .mockImplementation(async (callback: (inner: typeof tx) => Promise<unknown>) => callback(tx));
     const demandRecord = {
       id: "demand_1",
       projectId: "project_1",
@@ -136,7 +138,8 @@ describe("assistant demand fill tool", () => {
       roleEntity: { name: "Designer" },
       project: { id: "project_1", name: "Project One", shortCode: "PROJ-1" },
     };
-    const demandFindUnique = vi.fn()
+    const demandFindUnique = vi
+      .fn()
       .mockResolvedValueOnce(demandRecord)
       .mockResolvedValueOnce(demandRecord);
     const resourceFindUnique = vi.fn().mockResolvedValue({
@@ -194,16 +197,20 @@ describe("assistant demand fill tool", () => {
       ctx,
     );
 
-    expect(JSON.parse(result.content)).toEqual(expect.objectContaining({
-      success: true,
-      message: "Assigned Carol Danvers to Designer on Project One (PROJ-1)",
-      assignmentId: "assignment_1",
-    }));
+    expect(JSON.parse(result.content)).toEqual(
+      expect.objectContaining({
+        success: true,
+        message: "Assigned Carol Danvers to Designer on Project One (PROJ-1)",
+        assignmentId: "assignment_1",
+      }),
+    );
     expect(assignmentCreate).toHaveBeenCalledTimes(1);
-    expect(txDemandUpdate).toHaveBeenCalledWith(expect.objectContaining({
-      where: { id: "demand_1" },
-      data: { status: "COMPLETED" },
-    }));
+    expect(txDemandUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: { id: "demand_1" },
+        data: { status: "COMPLETED" },
+      }),
+    );
     expect(auditCreate).toHaveBeenCalledTimes(1);
   });
 });