diff --git a/.github/workflows/ci-typescript-frontend.yaml b/.github/workflows/ci-typescript-frontend.yaml
new file mode 100644
index 0000000..a5031d4
--- /dev/null
+++ b/.github/workflows/ci-typescript-frontend.yaml
@@ -0,0 +1,203 @@
+name: CI — TypeScript Frontend
+
+# Reusable CI for bundled TypeScript front-end apps (Vite / React / Vue SPAs
+# with vitest + Playwright). Emits the single `ci / ci` status context required
+# by the org branch-protection rulesets — keep the caller job id `ci` so the
+# context resolves to `ci / ci`.
+#
+# Runs, in order: a Sea Haven standards gate (required npm scripts present, no
+# AI-tool footers / hook bypasses / hardcoded secrets in the added lines),
+# then format:check, lint, build, unit tests, and an optional Playwright
+# browser smoke. Every step past the standards gate is individually toggleable.
+#
+# Caller example:
+#   jobs:
+#     ci:
+#       uses: Sea-Haven-Industries/.github/.github/workflows/ci-typescript-frontend.yaml@main
+#       with:
+#         node-version: "24"
+
+on:
+  workflow_call:
+    inputs:
+      node-version:
+        description: "Node.js version to use"
+        type: string
+        default: "24"
+      working-directory:
+        description: "Directory to run npm/build/test commands from"
+        type: string
+        default: "."
+      cache-dependency-path:
+        description: "Path to package-lock.json for npm cache"
+        type: string
+        default: "package-lock.json"
+      required-scripts:
+        description: "Comma-separated npm scripts that must exist in package.json"
+        type: string
+        default: "format:check,lint,build,test,test:e2e"
+      run-standards:
+        description: "Verify required npm scripts exist"
+        type: boolean
+        default: true
+      run-guard:
+        description: "Guard added lines against AI-tool footers, hook bypasses, and hardcoded secrets"
+        type: boolean
+        default: true
+      run-format-check:
+        description: "Run the format:check script (Prettier)"
+        type: boolean
+        default: true
+      run-lint:
+        description: "Run the lint script (ESLint)"
+        type: boolean
+        default: true
+      run-build:
+        description: "Run the build script"
+        type: boolean
+        default: true
+      run-tests:
+        description: "Run the test script (vitest / unit tests)"
+        type: boolean
+        default: true
+      run-e2e:
+        description: "Run the test:e2e script (Playwright browser smoke)"
+        type: boolean
+        default: true
+      e2e-browser:
+        description: "Playwright browser to install for the e2e smoke"
+        type: string
+        default: "chromium"
+      run-conventions-check:
+        description: "Require README.md and a .gitignore that covers .env"
+        type: boolean
+        default: true
+
+permissions:
+  contents: read
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    concurrency:
+      group: ci-typescript-frontend-${{ github.workflow }}-${{ github.ref }}-${{ inputs.working-directory }}
+      cancel-in-progress: true
+    defaults:
+      run:
+        working-directory: ${{ inputs.working-directory }}
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version: ${{ inputs.node-version }}
+          cache: npm
+          cache-dependency-path: ${{ inputs.cache-dependency-path }}
+
+      - name: Verify required npm scripts
+        if: ${{ inputs.run-standards }}
+        env:
+          REQUIRED_SCRIPTS: ${{ inputs.required-scripts }}
+        run: |
+          node <<'NODE'
+          const { readFileSync } = require("node:fs");
+          const pkg = JSON.parse(readFileSync("package.json", "utf8"));
+          const required = (process.env.REQUIRED_SCRIPTS || "")
+            .split(",")
+            .map((s) => s.trim())
+            .filter(Boolean);
+          const missing = required.filter((script) => !pkg.scripts?.[script]);
+
+          if (missing.length > 0) {
+            console.error(`Missing required scripts: ${missing.join(", ")}`);
+            process.exit(1);
+          }
+          console.log(`All required scripts present: ${required.join(", ")}`);
+          NODE
+
+      - name: Guard changed lines
+        if: ${{ inputs.run-guard }}
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          PR_BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          PUSH_BEFORE: ${{ github.event.before }}
+        run: |
+          set -euo pipefail
+
+          if [ "${EVENT_NAME}" = "pull_request" ]; then
+            BASE_REF="${PR_BASE_SHA}"
+          else
+            BASE_REF="${PUSH_BEFORE}"
+          fi
+
+          if [ -z "${BASE_REF}" ] || [ "${BASE_REF}" = "0000000000000000000000000000000000000000" ]; then
+            BASE_REF="$(git rev-parse HEAD~1 2>/dev/null || true)"
+          fi
+
+          if [ -z "${BASE_REF}" ]; then
+            echo "No base ref available; skipping changed-line guard."
+            exit 0
+          fi
+
+          ADDED_LINES="$(git diff --unified=0 "${BASE_REF}" "${GITHUB_SHA}" | grep -E '^\+' | grep -vE '^\+\+\+' || true)"
+
+          if printf '%s\n' "${ADDED_LINES}" | grep -E 'Generated with (Claude [C]ode|[C]odex|Chat[G]PT)|--no-[v]erify|HUSKY[=]0'; then
+            echo "Found generated-tool footer or hook bypass wording in added lines."
+            exit 1
+          fi
+
+          if printf '%s\n' "${ADDED_LINES}" | grep -E 'A[K]IA[0-9A-Z]{16}|A[S]IA[0-9A-Z]{16}|AWS[_]SECRET[_]ACCESS[_]KEY|aws[_-]?secret[_-]?access[_-]?key|J[W]TAuthenticationHIGHsecuredPassword|P[a]ssword=|S[e]ndGrid.*A[p]iKey'; then
+            echo "Found a likely secret in added lines. Move sensitive values to the environment or secret manager."
+            exit 1
+          fi
+
+          echo "Changed-line guard passed."
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Format check
+        if: ${{ inputs.run-format-check }}
+        run: npm run format:check
+
+      - name: Lint
+        if: ${{ inputs.run-lint }}
+        run: npm run lint
+
+      - name: Build
+        if: ${{ inputs.run-build }}
+        run: npm run build
+
+      - name: Unit tests
+        if: ${{ inputs.run-tests }}
+        run: npm test
+
+      - name: Browser smoke
+        if: ${{ inputs.run-e2e }}
+        env:
+          CI: "true"
+          E2E_BROWSER: ${{ inputs.e2e-browser }}
+        run: |
+          npx playwright install --with-deps "${E2E_BROWSER}"
+          npm run test:e2e
+
+      - name: Conventions check
+        if: ${{ inputs.run-conventions-check }}
+        working-directory: ${{ github.workspace }}
+        run: |
+          errors=0
+          fail() { echo "::error::$1"; errors=$((errors + 1)); }
+          [[ -f README.md ]] || fail "Missing README.md"
+          if [[ -f .gitignore ]]; then
+            grep -qE '^\.env$|^\.env\b' .gitignore || fail ".gitignore does not include .env"
+          else
+            fail "Missing .gitignore"
+          fi
+          if [[ $errors -gt 0 ]]; then
+            echo "Conventions check failed with $errors error(s)."
+            exit 1
+          fi
+          echo "Conventions check passed."
diff --git a/README.md b/README.md
index 13331c8..096beb9 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@ Organization-level GitHub configuration for Sea Haven Industries.
 
 **`.github/workflows/ci-typescript-cdk.yaml`** — Reusable CI workflow for TypeScript / CDK repos. Runs `npm ci` + optional `tsc --noEmit`, optional ESLint, optional Jest, and optional `cdk synth`. Also supports Node.js SAM repos via an optional `sam validate` step.
 
+**`.github/workflows/ci-typescript-frontend.yaml`** — Reusable CI workflow for bundled TypeScript front-end apps (Vite / React / Vue SPAs). Runs a Sea Haven standards gate (required npm scripts present, no AI-tool footers / hook bypasses / hardcoded secrets in added lines), then `format:check`, `lint`, `build`, vitest unit tests, and an optional Playwright browser smoke. Emits the single `ci / ci` status context — keep the caller job id `ci`.
+
 **`.github/workflows/cd-sam.yaml`** — Reusable CD workflow for SAM repos. Runs `sam build` + `sam deploy` with OIDC credentials and a CloudFormation execution role. Triggers via `workflow_call` from per-repo `deploy.yaml` on push to `main`.
 
 **`.github/workflows/cd-cdk.yaml`** — Reusable CD workflow for CDK repos (TypeScript and Python). Runs `cdk deploy --all` with OIDC credentials. Supports optional Python setup for Python CDK repos and QEMU emulation for cross-platform Docker builds.