Initial commit: Converge portfolio rationalization app

Next.js app for mapping a customer's competitive tool landscape onto our
portfolio and building the consolidation business case: assessment
workbench, customer report and Word export, product catalog, competitive
knowledge base, dossier import, shareable landscape questionnaires with a
review inbox, tool-footprint and business-unit value analysis, and an
implementation timeline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/api/assessments/route.ts

@@ -0,0 +1,24 @@
+import { NextResponse } from "next/server";
+import { createAssessment, listAssessments, saveAssessment } from "@/lib/store";
+import type { Assessment } from "@/lib/types";
+
+export async function GET() {
+  return NextResponse.json(await listAssessments());
+}
+
+export async function POST(req: Request) {
+  const body = await req.json().catch(() => ({}));
+  // An "import" payload carries a full candidate list; anything else is a fresh assessment.
+  if (body?.import) {
+    const src = body.import as Assessment;
+    const created = await createAssessment({ ...src, candidates: src.candidates ?? [] });
+    return NextResponse.json(created, { status: 201 });
+  }
+  return NextResponse.json(await createAssessment(body), { status: 201 });
+}
+
+export async function PUT(req: Request) {
+  const a = (await req.json()) as Assessment;
+  if (!a?.id) return NextResponse.json({ error: "Missing id" }, { status: 400 });
+  return NextResponse.json(await saveAssessment(a));
+}