Clear and rewrite

The v0.dev prototype history above is superseded by the maintained
exchange-rate-export implementation replayed after this commit.

.github/workflows/ci.yml

@@ -1,41 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-  workflow_dispatch:
-
-concurrency:
-  group: ci-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build:
-    name: Typecheck and build
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: pnpm/action-setup@v4
-        with:
-          version: 11
-
-      - uses: actions/setup-node@v4
-        with:
-          node-version: 22
-          cache: pnpm
-
-      # Fails if pnpm-lock.yaml drifts from package.json, so dependency
-      # overrides cannot silently stop applying.
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
-
-      # next.config.mjs skips type errors during builds, so check types here
-      # where a regression actually fails the run.
-      - name: Typecheck
-        run: pnpm exec tsc --noEmit
-
-      - name: Build
-        run: pnpm run build