diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e64102009..3ede413bb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -647,7 +647,7 @@ jobs:
       # honored, not just replayed from cache).
       - name: UI build
         if: ${{ github.event_name == 'push' || needs.changes.outputs.ui == 'true' }}
-        run: npx turbo run build --filter=@loopover/ui
+        run: npx turbo run build --filter=@loopover/ui --filter=@loopover/ui-miner
       # Paired with "Restore Turborepo cache" above (same key, same gate condition) -- deliberately
       # positioned here, after every turbo-routed step in this job (Build engine package, Build MCP, Build
       # miner CLI, Build UI-kit package, UI lint/typecheck, Extension lint/typecheck, UI build), rather than
@@ -662,21 +662,21 @@ jobs:
         with:
           path: .turbo/cache
           key: turbo-code-${{ hashFiles('package-lock.json') }}-${{ github.run_id }}
-      # Bundle-size regression tracking for the deployed marketing/product site (loopover-ui only --
-      # loopover-miner-ui is a self-hosted operator dashboard with no build step in this job at all, see
-      # "UI build" above). Fork-excluded (no secrets.CODECOV_TOKEN on a fork PR, same boundary as the
-      # coverage-upload steps below) and non-blocking (continue-on-error): unlike coverage, nothing gates
-      # merges on bundle size, so an upload hiccup must never fail CI. Uses @codecov/bundle-analyzer's
-      # standalone CLI against the built dist/client directly rather than a bundler-plugin hook --
-      # @codecov/vite-plugin's latest release doesn't support this repo's Vite 8 yet (peer range caps at
-      # 6.x; this repo's Vite 8 runs on rolldown, not classic rollup, so @codecov/rollup-plugin doesn't fit
-      # either) -- revisit wiring the plugin in once upstream catches up.
+      # Bundle-size regression tracking for the deployed marketing/product site (loopover-ui) and the
+      # miner-ui demo/self-host SPA (loopover-miner-ui, #5963). Fork-excluded (no secrets.CODECOV_TOKEN
+      # on a fork PR, same boundary as the coverage-upload steps below) and non-blocking
+      # (continue-on-error): unlike coverage, nothing gates merges on bundle size, so an upload hiccup
+      # must never fail CI. Uses @codecov/bundle-analyzer's standalone CLI against the built dist
+      # directly rather than a bundler-plugin hook -- @codecov/vite-plugin's latest release doesn't
+      # support this repo's Vite 8 yet (peer range caps at 6.x; this repo's Vite 8 runs on rolldown,
+      # not classic rollup, so @codecov/rollup-plugin doesn't fit either) -- revisit wiring the plugin
+      # in once upstream catches up.
       - name: Upload UI bundle stats to Codecov
         if: ${{ (github.event_name == 'push' || needs.changes.outputs.ui == 'true') && github.event.pull_request.head.repo.fork != true }}
         continue-on-error: true
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
-        run: npm run bundle-analysis --workspace @loopover/ui
+        run: npm run bundle-analysis --workspace @loopover/ui && npm run bundle-analysis --workspace @loopover/ui-miner
 
   # The full-suite coverage run, sharded (#ci-shard-coverage). This alone was ~9-10 of the ~11 minutes a
   # typical backend PR spent in validate-code, because vitest schedules whole test FILES atomically to
diff --git a/.github/workflows/miner-ui-demo-deploy.yml b/.github/workflows/miner-ui-demo-deploy.yml
new file mode 100644
index 000000000..547de53cf
--- /dev/null
+++ b/.github/workflows/miner-ui-demo-deploy.yml
@@ -0,0 +1,60 @@
+name: Deploy miner-ui demo Worker
+
+# Manual deploy of the apps/loopover-miner-ui public demo (#5963). Mirrors ui-deploy.yml's
+# workflow_dispatch-only trigger so a stale or broken demo never redeploys on every commit.
+# Builds with Vite `--mode demo` (VITE_DEMO_MODE baked in vite.config.ts) so the static SPA needs no
+# SQLite / Vite middleware backend on Cloudflare.
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: miner-ui-demo-deploy-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    name: Build and deploy demo
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
+
+      - name: Check Cloudflare secrets
+        id: cfg
+        env:
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+        run: |
+          if [ -n "$CLOUDFLARE_API_TOKEN" ] && [ -n "$CLOUDFLARE_ACCOUNT_ID" ]; then
+            echo "ready=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "ready=false" >> "$GITHUB_OUTPUT"
+            echo "::notice::CLOUDFLARE_API_TOKEN / CLOUDFLARE_ACCOUNT_ID not set — building demo only, skipping deploy."
+          fi
+
+      - name: Setup Node
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build miner-ui demo
+        run: npx turbo run build --filter=@loopover/engine --filter=@loopover/ui-kit && npm --workspace @loopover/ui-miner run build:demo
+
+      - name: Deploy demo Worker
+        if: steps.cfg.outputs.ready == 'true'
+        working-directory: apps/loopover-miner-ui
+        env:
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+        run: npx wrangler deploy
diff --git a/apps/loopover-miner-ui/README.md b/apps/loopover-miner-ui/README.md
index c4da76961..8d136fb56 100644
--- a/apps/loopover-miner-ui/README.md
+++ b/apps/loopover-miner-ui/README.md
@@ -1,15 +1,29 @@
 # LoopOver Miner UI
 
 Local, read-only dashboard for a laptop or fleet miner instance. It mirrors the main
-`apps/loopover-ui/` tooling versions (React 19, TanStack Router, Vite, Tailwind v4) but intentionally
-does **not** adopt that app's Cloudflare Worker deploy model or `@lovable.dev/*` scaffold dependency.
+`apps/loopover-ui/` tooling versions (React 19, TanStack Router, Vite, Tailwind v4).
 
 The miner package invariant is client-side only with no required phone-home to boot
-(`packages/loopover-miner/DEPLOYMENT.md`). This app is a plain Vite dev server / static build that a
-local miner CLI can serve later — not a Wrangler deploy target.
+(`packages/loopover-miner/DEPLOYMENT.md`). For day-to-day operator use this app is a plain Vite
+dev server / static build that a local miner CLI can serve — see “Running as a persistent
+service” below.
 
-The Phase 6 data views have shipped: an overview summary (`routes/index.tsx`, #4853) alongside dedicated
-run-history, portfolio, and ledgers views, each fed by the local read-only `/api/*` endpoints below.
+## Public demo Worker (#5963)
+
+A **demo-mode** Cloudflare Worker build exists for sales/marketing prototypes and for Codecov
+Bundle Analysis in CI. It uses the same SPA codebase with `VITE_DEMO_MODE=1` baked at build time
+(`vite build --mode demo`), so client fetchers return synthetic fixtures and no SQLite / Vite
+middleware backend is required on Cloudflare.
+
+| Command | Purpose |
+| --- | --- |
+| `npm run build:demo` (in this workspace) | Static SPA with demo mode baked in |
+| `npm run deploy:demo` | Build demo + `wrangler deploy` (needs CF credentials) |
+| `.github/workflows/miner-ui-demo-deploy.yml` | Manual `workflow_dispatch` CI deploy (mirrors `ui-deploy.yml`) |
+
+Custom domain routing is intentionally omitted until DNS is provisioned; `workers.dev` preview is
+enough for the prototype. The Worker name is `loopover-miner-ui-demo` so it never collides with
+`loopover-ui` / `loopover-api`.
 
 ## Configuration
 
diff --git a/apps/loopover-miner-ui/package.json b/apps/loopover-miner-ui/package.json
index eaa28a924..4e8ecbb6c 100644
--- a/apps/loopover-miner-ui/package.json
+++ b/apps/loopover-miner-ui/package.json
@@ -8,7 +8,11 @@
   "scripts": {
     "dev": "vite dev",
     "build": "vite build",
+    "build:demo": "vite build --mode demo",
     "preview": "vite preview",
+    "preview:demo": "vite preview --mode demo",
+    "bundle-analysis": "bundle-analyzer ./dist --bundle-name=loopover-miner-ui --upload-token=$CODECOV_TOKEN",
+    "deploy:demo": "npm run build:demo && wrangler deploy",
     "typecheck": "tsc --noEmit",
     "lint": "eslint .",
     "test": "vitest run --coverage",
@@ -26,6 +30,7 @@
     "vite-tsconfig-paths": "^6.1.1"
   },
   "devDependencies": {
+    "@codecov/bundle-analyzer": "^2.0.1",
     "@eslint/js": "^9.39.4",
     "@tanstack/router-plugin": "^1.168.19",
     "@testing-library/dom": "^10.4.1",
diff --git a/apps/loopover-miner-ui/vite.config.ts b/apps/loopover-miner-ui/vite.config.ts
index 9abb4b339..38d88b43b 100644
--- a/apps/loopover-miner-ui/vite.config.ts
+++ b/apps/loopover-miner-ui/vite.config.ts
@@ -17,7 +17,16 @@ import { portfolioQueueApiPlugin } from "./vite-portfolio-queue-api";
 import { rankedCandidatesApiPlugin } from "./vite-ranked-candidates-api";
 import { runStateApiPlugin } from "./vite-run-state-api";
 
-export default defineConfig({
+export default defineConfig(({ mode }) => ({
+  // `--mode demo` (#5963) — bake VITE_DEMO_MODE so the static CF Worker build needs no .env file
+  // (`.env.*` is gitignored). Must be the string `"1"` to match `isDemoMode()` in demo-data.ts.
+  // Self-host `vite build` / `vite dev` leave demo mode off.
+  define:
+    mode === "demo"
+      ? {
+          "import.meta.env.VITE_DEMO_MODE": JSON.stringify("1"),
+        }
+      : undefined,
   plugins: [
     TanStackRouterVite({ target: "react", autoCodeSplitting: true }),
     react(),
@@ -48,4 +57,4 @@ export default defineConfig({
     port: 4174,
     strictPort: true,
   },
-});
+}));
diff --git a/apps/loopover-miner-ui/wrangler.jsonc b/apps/loopover-miner-ui/wrangler.jsonc
new file mode 100644
index 000000000..d2e1a1e98
--- /dev/null
+++ b/apps/loopover-miner-ui/wrangler.jsonc
@@ -0,0 +1,14 @@
+{
+  // Public prototype/demo Worker for apps/loopover-miner-ui (#5963). Static SPA assets only —
+  // client fetchers serve synthetic data when built with `vite build --mode demo`. Custom domain
+  // routes are intentionally omitted until DNS is provisioned; workers.dev preview is enough for
+  // the prototype. Distinct Worker name so it never collides with `loopover-ui` / `loopover-api`.
+  "name": "loopover-miner-ui-demo",
+  "compatibility_date": "2026-05-28",
+  "workers_dev": true,
+  "preview_urls": true,
+  "assets": {
+    "directory": "./dist",
+    "not_found_handling": "single-page-application",
+  },
+}
diff --git a/package-lock.json b/package-lock.json
index 6fa0ae9d4..e2e01e828 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -92,6 +92,7 @@
         "vite-tsconfig-paths": "^6.1.1"
       },
       "devDependencies": {
+        "@codecov/bundle-analyzer": "^2.0.1",
         "@eslint/js": "^9.39.4",
         "@tanstack/router-plugin": "^1.168.19",
         "@testing-library/dom": "^10.4.1",
diff --git a/test/unit/ci-extension-packages.test.ts b/test/unit/ci-extension-packages.test.ts
index eff1df001..5ba2734db 100644
--- a/test/unit/ci-extension-packages.test.ts
+++ b/test/unit/ci-extension-packages.test.ts
@@ -35,6 +35,7 @@ describe("browser extension workspace packages (#4866)", () => {
       "npx turbo run typecheck --filter=@loopover/extension --filter=@loopover/miner-extension",
     );
     // @loopover/ui#build's dependsOn (turbo.json) covers the extension + miner-extension build pair.
-    expect(workflow).toContain("run: npx turbo run build --filter=@loopover/ui");
+    // #5963 also builds @loopover/ui-miner for Codecov Bundle Analysis.
+    expect(workflow).toContain("run: npx turbo run build --filter=@loopover/ui --filter=@loopover/ui-miner");
   });
 });
diff --git a/test/unit/ci-ui-build-openapi.test.ts b/test/unit/ci-ui-build-openapi.test.ts
index a3584b29f..2913be686 100644
--- a/test/unit/ci-ui-build-openapi.test.ts
+++ b/test/unit/ci-ui-build-openapi.test.ts
@@ -18,7 +18,8 @@ describe("UI build steps skip the redundant OpenAPI regen", () => {
 
     // @loopover/ui#build's dependsOn (turbo.json) covers the same extension + miner-extension build pair
     // the old hand-chained `&&` command ran explicitly -- see turbo.json's comment on that task.
-    expect(step).toContain("run: npx turbo run build --filter=@loopover/ui");
+    // #5963 also builds @loopover/ui-miner so Codecov Bundle Analysis has a dist to upload for it.
+    expect(step).toContain("run: npx turbo run build --filter=@loopover/ui --filter=@loopover/ui-miner");
     expect(step).not.toContain("npm run ui:build");
   });
 
@@ -30,4 +31,13 @@ describe("UI build steps skip the redundant OpenAPI regen", () => {
     );
     expect(workflow).not.toContain("&& npm run ui:build");
   });
+
+  it("miner-ui-demo-deploy.yml builds the demo mode SPA on workflow_dispatch (#5963)", () => {
+    const workflow = read(".github/workflows/miner-ui-demo-deploy.yml");
+    expect(workflow).toContain("workflow_dispatch");
+    expect(workflow).toContain("npm --workspace @loopover/ui-miner run build:demo");
+    expect(workflow).toContain("npx wrangler deploy");
+    // Vite config resolution imports engine packages; build engine (+ ui-kit) before demo.
+    expect(workflow).toContain("npx turbo run build --filter=@loopover/engine --filter=@loopover/ui-kit");
+  });
 });
diff --git a/test/unit/codecov-policy.test.ts b/test/unit/codecov-policy.test.ts
index 55b952bd2..d5a14c215 100644
--- a/test/unit/codecov-policy.test.ts
+++ b/test/unit/codecov-policy.test.ts
@@ -165,10 +165,8 @@ describe("Codecov policy", () => {
     expect(trustedWith.token).toBe("${{ secrets.CODECOV_TOKEN }}");
   });
 
-  it("uploads loopover-ui's bundle stats without letting an upload hiccup fail CI", () => {
-    // loopover-miner-ui deliberately has no build step in this job at all (self-hosted operator
-    // dashboard, not something we deploy -- see "UI build"'s own comment), so there is nothing to
-    // upload bundle stats for on that app here.
+  it("uploads loopover-ui and loopover-miner-ui bundle stats without letting an upload hiccup fail CI", () => {
+    // Both SPAs now have a CI build step (#5963 added miner-ui); bundle uploads stay non-blocking.
     const workflow = readYaml(".github/workflows/ci.yml");
     const validateCode = nestedRecord(workflow, ["jobs", "validate-code"]);
     const steps = recordArray(validateCode.steps, "jobs.validate-code.steps");
@@ -178,6 +176,9 @@ describe("Codecov policy", () => {
     expect(buildIndex).toBeGreaterThan(-1);
     expect(bundleIndex).toBeGreaterThan(buildIndex);
 
+    const buildStep = steps[buildIndex]!;
+    expect(String(buildStep.run)).toContain("--filter=@loopover/ui-miner");
+
     const bundleStep = steps[bundleIndex]!;
     // Unlike the coverage uploads above, nothing gates a merge on bundle size -- a Codecov outage or a
     // missing token must never fail CI for an otherwise-honest PR.
@@ -185,7 +186,9 @@ describe("Codecov policy", () => {
     expect(String(bundleStep.if)).toContain("github.event.pull_request.head.repo.fork != true");
     const bundleEnv = record(bundleStep.env, "bundle step env");
     expect(bundleEnv.CODECOV_TOKEN).toBe("${{ secrets.CODECOV_TOKEN }}");
-    expect(bundleStep.run).toBe("npm run bundle-analysis --workspace @loopover/ui");
+    expect(bundleStep.run).toBe(
+      "npm run bundle-analysis --workspace @loopover/ui && npm run bundle-analysis --workspace @loopover/ui-miner",
+    );
 
     const uiPkg = JSON.parse(readFileSync("apps/loopover-ui/package.json", "utf8")) as {
       scripts: Record<string, string>;
@@ -195,6 +198,16 @@ describe("Codecov policy", () => {
       "bundle-analyzer ./dist/client --bundle-name=loopover-ui --upload-token=$CODECOV_TOKEN",
     );
     expect(uiPkg.devDependencies["@codecov/bundle-analyzer"]).toBeDefined();
+
+    const minerUiPkg = JSON.parse(readFileSync("apps/loopover-miner-ui/package.json", "utf8")) as {
+      scripts: Record<string, string>;
+      devDependencies: Record<string, string>;
+    };
+    expect(minerUiPkg.scripts["bundle-analysis"]).toBe(
+      "bundle-analyzer ./dist --bundle-name=loopover-miner-ui --upload-token=$CODECOV_TOKEN",
+    );
+    expect(minerUiPkg.scripts["build:demo"]).toBe("vite build --mode demo");
+    expect(minerUiPkg.devDependencies["@codecov/bundle-analyzer"]).toBeDefined();
   });
 
   it("captures review-enrichment node:test coverage for Codecov (#6250)", () => {