diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index ca79ca5..bda23cd 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -4,3 +4,9 @@ updates:
     directory: /
     schedule:
       interval: weekly
+  # The CAP app's own dependencies live in src/ (@sap/cds, jest, mbt, …); the
+  # published app lock is regenerated from here, so keep this manifest current.
+  - package-ecosystem: npm
+    directory: /src
+    schedule:
+      interval: weekly
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a81d300..a14c7ec 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,8 +24,9 @@ jobs:
       - uses: actions/setup-node@v5
         with:
           node-version: 22
-      # the builder's own dev deps (jest for the script tests)
+      # the builder's own dev deps (jest for the script tests, eslint)
       - run: npm ci
+      - run: npm run lint
       - run: npm run assemble
       # one install covers the app AND the vendored core (its deps are part
       # of the app lock, placed under core/node_modules/)
diff --git a/.github/workflows/update_cap.yml b/.github/workflows/update_cap.yml
index 3e492cc..45c1793 100644
--- a/.github/workflows/update_cap.yml
+++ b/.github/workflows/update_cap.yml
@@ -44,6 +44,16 @@ jobs:
       # the builder's own dev deps (jest for the script tests, run by `npm test`)
       - run: npm ci
       - run: npm run mirror_core
+      - run: npm run assemble
+      # one install covers the app AND the vendored core (its deps are part
+      # of the app lock, placed under core/node_modules/)
+      - run: npm ci
+        working-directory: run/output/cap2UI5
+      - run: npm test
+      # Commit the refreshed mirror ONLY after assemble + the app's jest suite
+      # pass. Committing earlier would land a broken upstream core on main
+      # permanently even though the publish is correctly gated; gating the
+      # mirror commit on the same green keeps main buildable.
       - name: commit refreshed mirror
         run: |
           git config user.name "github-actions[bot]"
@@ -66,12 +76,6 @@ jobs:
               sleep $((i * 2))
             done
           fi
-      - run: npm run assemble
-      # one install covers the app AND the vendored core (its deps are part
-      # of the app lock, placed under core/node_modules/)
-      - run: npm ci
-        working-directory: run/output/cap2UI5
-      - run: npm test
       - name: publish built app to cap2UI5/cap2UI5
         env:
           ACTION_KEY_APP: ${{ secrets.ACTION_KEY_APP }}
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..62db8b5
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,72 @@
+// ESLint flat config for the builder's own hand-written code: the build
+// scripts (mirror/assemble/publish), the builder tests, and the CAP app
+// source in src/srv + src/test. Generated/assembled trees (run/), the mirror
+// (run/input), node_modules and the upstream UI5 webapp (src/app, browser
+// globals) are excluded.
+"use strict";
+
+const js = require("@eslint/js");
+
+module.exports = [
+  {
+    ignores: [
+      "run/**",
+      "node_modules/**",
+      "src/app/**",
+      "src/gen/**",
+      "coverage/**",
+    ],
+  },
+  js.configs.recommended,
+  {
+    files: ["scripts/**/*.js", "test/**/*.js", "src/srv/**/*.js", "src/test/**/*.js"],
+    languageOptions: {
+      ecmaVersion: 2023,
+      sourceType: "commonjs",
+      globals: {
+        require: "readonly",
+        module: "writable",
+        exports: "writable",
+        process: "readonly",
+        __dirname: "readonly",
+        __filename: "readonly",
+        console: "readonly",
+        Buffer: "readonly",
+        setInterval: "readonly",
+        clearInterval: "readonly",
+        setTimeout: "readonly",
+        globalThis: "readonly",
+        // CAP globals used in the service/server code and tests.
+        SELECT: "readonly",
+        INSERT: "readonly",
+        UPDATE: "readonly",
+        DELETE: "readonly",
+        cds: "readonly",
+      },
+    },
+    rules: {
+      "no-unused-vars": ["warn", { argsIgnorePattern: "^_", varsIgnorePattern: "^_", caughtErrors: "none" }],
+      "no-empty": ["warn", { allowEmptyCatch: true }],
+    },
+  },
+  {
+    files: ["test/**/*.js", "src/test/**/*.js", "**/*.test.js"],
+    languageOptions: {
+      globals: {
+        describe: "readonly",
+        test: "readonly",
+        it: "readonly",
+        expect: "readonly",
+        beforeEach: "readonly",
+        afterEach: "readonly",
+        beforeAll: "readonly",
+        afterAll: "readonly",
+        jest: "readonly",
+      },
+    },
+  },
+  {
+    files: ["*.config.js"],
+    languageOptions: { globals: { require: "readonly", module: "writable" } },
+  },
+];
diff --git a/package-lock.json b/package-lock.json
index 757f158..9aacf32 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,8 @@
       "version": "1.0.0",
       "license": "MIT",
       "devDependencies": {
+        "@eslint/js": "^9.39.5",
+        "eslint": "^9.39.5",
         "jest": "^30.4.2"
       },
       "engines": {
@@ -545,6 +547,294 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+      "integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+      "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.2",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+      "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@eslint/config-array": {
+      "version": "0.21.2",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.2.tgz",
+      "integrity": "sha512-nJl2KGTlrf9GjLimgIru+V/mzgSK0ABCDQRvxw5BjURL7WfH5uoWmizbH7QB6MmnMBd8cIC9uceWnezL1VZWWw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
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+        "debug": "^4.3.1",
+        "minimatch": "^3.1.5"
+      },
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+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/config-array/node_modules/brace-expansion": {
+      "version": "1.1.16",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.16.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/@eslint/config-array/node_modules/minimatch": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.5.tgz",
+      "integrity": "sha512-VgjWUsnnT6n+NUk6eZq77zeFdpW2LWDzP6zFGrCbHXiYNul5Dzqk2HHQ5uFH2DNW5Xbp8+jVzaeNt94ssEEl4w==",
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+    "node_modules/@eslint/config-helpers": {
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+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
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+    "node_modules/@eslint/eslintrc": {
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+        "globals": "^14.0.0",
+        "ignore": "^5.2.0",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^4.3.0",
+        "minimatch": "^3.1.5",
+        "strip-json-comments": "^3.1.1"
+      },
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+      }
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+        "concat-map": "0.0.1"
+      }
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+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.3.0.tgz",
+      "integrity": "sha512-1td788aAnnZ5qs7V2QIRl1owjtYpbKt749Y3xauqQgwIIGF/xXWz1wMTEBx5O3LK3lXLVuqXPdPxj2BoFHaW9Q==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/puzrin"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/nodeca"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "argparse": "^2.0.1"
+      },
+      "bin": {
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+      }
+    },
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+      "license": "ISC",
+      "dependencies": {
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+      },
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+      }
+    },
+    "node_modules/@eslint/js": {
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+      "license": "MIT",
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+      },
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+      }
+    },
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+      "license": "Apache-2.0",
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+      }
+    },
+    "node_modules/@eslint/plugin-kit": {
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+        "@humanfs/types": "^0.15.0"
+      },
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+        "node": ">=18.18.0"
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@humanfs/core": "^0.19.2",
+        "@humanfs/types": "^0.15.0",
+        "@humanwhocodes/retry": "^0.4.0"
+      },
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanfs/types": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@humanfs/types/-/types-0.15.0.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18.0"
+      }
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+    "node_modules/@humanwhocodes/module-importer": {
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=12.22"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@humanwhocodes/retry": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
+      "integrity": "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
     "node_modules/@isaacs/cliui": {
       "version": "8.0.2",
       "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
@@ -1107,6 +1397,13 @@
         "@babel/types": "^7.28.2"
       }
     },
+    "node_modules/@types/estree": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
+      "integrity": "sha512-GhdPgy1el4/ImP05X05Uw4cw2/M93BCUmnEvWZNStlCzEKME4Fkk+YpoA5OiHNQmoS7Cafb8Xa3Pya8m1Qrzeg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/istanbul-lib-coverage": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz",
@@ -1134,6 +1431,13 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "node_modules/@types/json-schema": {
+      "version": "7.0.15",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
+      "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "26.1.1",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.1.tgz",
@@ -1488,6 +1792,46 @@
         "win32"
       ]
     },
+    "node_modules/acorn": {
+      "version": "8.17.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.17.0.tgz",
+      "integrity": "sha512-xRQbDb9BnwDafYNn6Vwl839DYVjqXYb1XVGtWAZ1kcDc6iwAL4hg3B1dZlRiuENFeO2H53gFG3in621AdERVAg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/acorn-jsx": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
+      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
+      "dev": true,
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     "node_modules/is-stream": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.1.tgz",
@@ -3168,6 +3893,13 @@
         "node": ">=6"
       }
     },
+    "node_modules/json-buffer": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/json-buffer/-/json-buffer-3.0.1.tgz",
+      "integrity": "sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/json-parse-even-better-errors": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz",
@@ -3175,6 +3907,20 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/json-schema-traverse": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+      "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/json-stable-stringify-without-jsonify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz",
+      "integrity": "sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/json5": {
       "version": "2.2.3",
       "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
@@ -3188,6 +3934,16 @@
         "node": ">=6"
       }
     },
+    "node_modules/keyv": {
+      "version": "4.5.4",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",
+      "integrity": "sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "json-buffer": "3.0.1"
+      }
+    },
     "node_modules/leven": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/leven/-/leven-3.1.0.tgz",
@@ -3198,6 +3954,20 @@
         "node": ">=6"
       }
     },
+    "node_modules/levn": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
+      "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1",
+        "type-check": "~0.4.0"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -3218,6 +3988,13 @@
         "node": ">=8"
       }
     },
+    "node_modules/lodash.merge": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
+      "integrity": "sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/lru-cache": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz",
@@ -3406,6 +4183,24 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/optionator": {
+      "version": "0.9.4",
+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
+      "integrity": "sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "deep-is": "^0.1.3",
+        "fast-levenshtein": "^2.0.6",
+        "levn": "^0.4.1",
+        "prelude-ls": "^1.2.1",
+        "type-check": "^0.4.0",
+        "word-wrap": "^1.2.5"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/p-limit": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",
@@ -3468,6 +4263,19 @@
       "dev": true,
       "license": "BlueOak-1.0.0"
     },
+    "node_modules/parent-module": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
+      "integrity": "sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "callsites": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/parse-json": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.2.0.tgz",
@@ -3584,6 +4392,16 @@
         "node": ">=8"
       }
     },
+    "node_modules/prelude-ls": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/pretty-format": {
       "version": "30.4.1",
       "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-30.4.1.tgz",
@@ -3613,6 +4431,16 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/pure-rand": {
       "version": "7.0.1",
       "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-7.0.1.tgz",
@@ -4055,6 +4883,19 @@
       "license": "0BSD",
       "optional": true
     },
+    "node_modules/type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
@@ -4154,6 +4995,16 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
     "node_modules/v8-to-istanbul": {
       "version": "9.3.0",
       "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.3.0.tgz",
@@ -4195,6 +5046,16 @@
         "node": ">= 8"
       }
     },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "8.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
diff --git a/package.json b/package.json
index 95e023f..aab618f 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
     "node": ">=22"
   },
   "scripts": {
+    "lint": "eslint .",
     "mirror_core": "node scripts/mirror-core.js",
     "assemble": "node scripts/assemble-cap.js",
     "publish": "node scripts/publish-cap.js",
@@ -27,6 +28,8 @@
   },
   "repository": "github:cap2UI5/builder-cap2UI5",
   "devDependencies": {
+    "@eslint/js": "^9.39.5",
+    "eslint": "^9.39.5",
     "jest": "^30.4.2"
   }
 }
diff --git a/scripts/assemble-cap.js b/scripts/assemble-cap.js
index 336d0c1..b74ddd6 100644
--- a/scripts/assemble-cap.js
+++ b/scripts/assemble-cap.js
@@ -127,8 +127,16 @@ console.log(`  overlay webapp (from the core) → app/z2ui5/webapp: ${countFiles
 // inside core/ (same layout as a standalone install of the core) and the
 // app lock deterministic without a registry roundtrip.
 const appLockPath = path.join(dest, "package-lock.json");
-const appLock = JSON.parse(fs.readFileSync(appLockPath, "utf8"));
-const coreLock = JSON.parse(fs.readFileSync(path.join(coreSrc, "package-lock.json"), "utf8"));
+let appLock, coreLock;
+try {
+  appLock = JSON.parse(fs.readFileSync(appLockPath, "utf8"));
+  coreLock = JSON.parse(fs.readFileSync(path.join(coreSrc, "package-lock.json"), "utf8"));
+} catch (e) {
+  // Symmetry with the guarded parse in the validation block below — fail with
+  // a clear message instead of a raw stack trace.
+  console.error(`assemble: failed to read/parse a lockfile before the core-lock merge: ${e.message}`);
+  process.exit(1);
+}
 let merged = 0;
 for (const [key, entry] of Object.entries(coreLock.packages || {})) {
   if (!key.startsWith("node_modules/")) continue;
@@ -162,6 +170,28 @@ console.log(`  merge core lock → package-lock.json: ${merged} entries under co
   }
   if (!appLock.packages?.["core"]) problems.push(`lock has no "core" package entry`);
   if (merged === 0) problems.push("core lock merge produced 0 entries — empty/renamed core lock?");
+
+  // Stale core-lock drift guard — the biggest latent risk in this pipeline.
+  // The app lock's "core" entry is a FROZEN snapshot of the core's
+  // package.json, taken when src/package-lock.json was last regenerated.
+  // mirror_core does NOT refresh it, so if the mirrored core changed its own
+  // dependencies, the vendored core/node_modules/* entries merged above
+  // disagree with this frozen entry and `npm ci` in the app fails with an
+  // out-of-sync lock. Catch it here with an actionable message.
+  try {
+    const coreManifest = JSON.parse(fs.readFileSync(path.join(coreSrc, "package.json"), "utf8"));
+    const frozen = JSON.stringify(appLock.packages?.["core"]?.dependencies ?? {});
+    const actual = JSON.stringify(coreManifest.dependencies ?? {});
+    if (frozen !== actual) {
+      problems.push(
+        `core dependencies drifted from the frozen lock: the mirrored core declares ${actual} but ` +
+        `src/package-lock.json's "core" entry has ${frozen}. Run \`npm install\` in src/ to refresh the lock.`,
+      );
+    }
+  } catch (e) {
+    problems.push(`could not compare core dependencies for drift: ${e.message}`);
+  }
+
   if (problems.length) {
     console.error(`assemble: output validation FAILED —\n  - ${problems.join("\n  - ")}`);
     process.exit(1);
diff --git a/src/package.json b/src/package.json
index 872134e..a904d6c 100644
--- a/src/package.json
+++ b/src/package.json
@@ -43,8 +43,19 @@
       "destinations": true,
       "html5-repo": true,
       "workzone": true,
-      "[production]": {
-        "auth": false
+      "auth": {
+        "[production]": "xsuaa",
+        "[development]": {
+          "kind": "mocked",
+          "users": {
+            "alice": {
+              "password": "alice",
+              "roles": [
+                "authenticated-user"
+              ]
+            }
+          }
+        }
       }
     }
   },
diff --git a/src/srv/server.js b/src/srv/server.js
index b553e37..8ab2d4b 100644
--- a/src/srv/server.js
+++ b/src/srv/server.js
@@ -44,6 +44,13 @@ engine.register_app_dir(require("path").join(__dirname, "app"));
 cds.on("served", () => require("./draft-retention").start());
 
 cds.on("bootstrap", (app) => {
+  // Readiness probe — mta.yaml declares
+  // readiness-health-check-http-endpoint: /health for the abap2UI5-srv
+  // module, so CF polls this route to decide the instance is up. It must stay
+  // public (the probe carries no auth) and cheap; a bare 200 is enough since
+  // the process answering at all is the signal CF needs.
+  app.get("/health", (_req, res) => res.status(200).json({ status: "UP" }));
+
   // Serve the local UI5 runtime at /resources (must be registered before the
   // CDS services so it is not shadowed by the OData/REST routing) — the app
   // bootstraps from `/resources/sap-ui-core.js` (see patch-frontend.js /
@@ -60,6 +67,13 @@ cds.on("bootstrap", (app) => {
     (_req, res) => res.status(404).end(),
   );
 
+  // Auth boundary: the DATA endpoints — the POST z2ui5 roundtrip action and
+  // the AdminService OData entities — are restricted to authenticated users
+  // (@requires in z2ui5-service.cds). The GET/HEAD routes below are
+  // deliberately left public: they serve only the static UI5 bootstrap shell
+  // and the CSRF/terminate ack, carry no user data, and keeping them open
+  // preserves the offline/dev flow. In BTP the approuter authenticates before
+  // the frontend can reach them anyway.
   app.get("/rest/root/z2ui5", (req, res) => {
     // The engine call renders arbitrary app HTML — never let a failure
     // escape as an unhandled express error (raw stack trace to the client).
diff --git a/src/srv/z2ui5-service.cds b/src/srv/z2ui5-service.cds
index 3404625..08cb509 100644
--- a/src/srv/z2ui5-service.cds
+++ b/src/srv/z2ui5-service.cds
@@ -4,7 +4,11 @@ using northwind from './external/northwind.csn';
 /**
  * OData service exposing the z2ui5 draft table (used by the starter page
  * to prove persistence) and the remote Northwind sample entity.
+ *
+ * Restricted to authenticated users: the draft table holds serialized
+ * application state, so it must never be readable/countable anonymously.
  */
+@(requires: 'authenticated-user')
 service AdminService {
     entity z2ui5_t_01 as projection on cap2ui5.z2ui5_t_01;
 
@@ -17,7 +21,13 @@ service AdminService {
 /**
  * REST-protocol service: the z2ui5 action is the single roundtrip endpoint.
  * Mounted at /rest/root/z2ui5 — frontends POST `{value: <oBody>}`.
+ *
+ * Restricted to authenticated users. In the BTP deployment the approuter
+ * authenticates via xsuaa and the srv destination forwards the JWT
+ * (HTML5.ForwardAuthToken), so the roundtrip runs under the real user; a
+ * direct unauthenticated call to the srv route is rejected.
  */
+@(requires: 'authenticated-user')
 @protocol: 'rest'
 service rootService {
 
diff --git a/src/test/northwind.test.js b/src/test/northwind.test.js
index 783e64a..9476d61 100644
--- a/src/test/northwind.test.js
+++ b/src/test/northwind.test.js
@@ -22,7 +22,9 @@ describe("NorthwindCustomers remote proxy", () => {
       return orig.call(this, name, ...rest);
     };
     try {
-      const res = await GET("/odata/v4/admin/NorthwindCustomers");
+      const res = await GET("/odata/v4/admin/NorthwindCustomers", {
+        auth: { username: "alice", password: "alice" },
+      });
       expect(res.status).toBe(200);
       expect(res.data.value.map((r) => r.CustomerID)).toEqual(["ALFKI", "ANATR"]);
       expect(res.data.value[0].CompanyName).toBe("Alfreds Futterkiste");
diff --git a/src/test/starter.test.js b/src/test/starter.test.js
index 2635e56..4d9e967 100644
--- a/src/test/starter.test.js
+++ b/src/test/starter.test.js
@@ -14,6 +14,11 @@ const cds = require("@sap/cds");
 
 const { GET, POST } = cds.test(path.join(__dirname, ".."));
 
+// The z2ui5 roundtrip action and the AdminService are now restricted to
+// authenticated users (see z2ui5-service.cds). Under the mocked dev auth the
+// requests run as the configured user (package.json cds.requires.auth).
+const AUTH = { auth: { username: "alice", password: "alice" } };
+
 const roundtripBody = {
   value: {
     S_FRONT: {
@@ -37,7 +42,7 @@ describe("minimal starter — frontend / service / database", () => {
   });
 
   test("(2) roundtrip POST returns the startup app, a draft id and view XML", async () => {
-    const { status, data } = await POST("/rest/root/z2ui5", roundtripBody);
+    const { status, data } = await POST("/rest/root/z2ui5", roundtripBody, AUTH);
     expect(status).toBe(200);
     expect(data.S_FRONT.APP).toBe("z2ui5_cl_app_startup");
     expect(data.S_FRONT.ID).toMatch(/^[0-9a-f-]{36}$/);
@@ -45,15 +50,24 @@ describe("minimal starter — frontend / service / database", () => {
   });
 
   test("(3) every roundtrip persists a draft row in cap2ui5.z2ui5_t_01", async () => {
-    const before = Number((await GET("/odata/v4/admin/z2ui5_t_01/$count")).data);
+    const before = Number((await GET("/odata/v4/admin/z2ui5_t_01/$count", AUTH)).data);
 
-    const { data } = await POST("/rest/root/z2ui5", roundtripBody);
+    const { data } = await POST("/rest/root/z2ui5", roundtripBody, AUTH);
 
-    const after = Number((await GET("/odata/v4/admin/z2ui5_t_01/$count")).data);
+    const after = Number((await GET("/odata/v4/admin/z2ui5_t_01/$count", AUTH)).data);
     expect(after).toBe(before + 1);
 
-    const row = await GET(`/odata/v4/admin/z2ui5_t_01(${data.S_FRONT.ID})`);
+    const row = await GET(`/odata/v4/admin/z2ui5_t_01(${data.S_FRONT.ID})`, AUTH);
     expect(row.status).toBe(200);
     expect(row.data.data).toContain("z2ui5_cl_app_startup");
   });
+
+  test("(4) the roundtrip and the draft table reject unauthenticated access", async () => {
+    await expect(POST("/rest/root/z2ui5", roundtripBody)).rejects.toMatchObject({
+      response: { status: 401 },
+    });
+    await expect(GET("/odata/v4/admin/z2ui5_t_01/$count")).rejects.toMatchObject({
+      response: { status: 401 },
+    });
+  });
 });
diff --git a/src/xs-security.json b/src/xs-security.json
index 48653a7..b92ce62 100644
--- a/src/xs-security.json
+++ b/src/xs-security.json
@@ -1,6 +1,18 @@
 {
-    "scopes": [],
-    "attributes": [],
-    "role-templates": []
-  }
-  
\ No newline at end of file
+  "scopes": [
+    {
+      "name": "$XSAPPNAME.User",
+      "description": "Use the z2ui5 application"
+    }
+  ],
+  "attributes": [],
+  "role-templates": [
+    {
+      "name": "User",
+      "description": "z2ui5 application user",
+      "scope-references": [
+        "$XSAPPNAME.User"
+      ]
+    }
+  ]
+}
diff --git a/test/assemble-cap.test.js b/test/assemble-cap.test.js
index 97a7339..0922133 100644
--- a/test/assemble-cap.test.js
+++ b/test/assemble-cap.test.js
@@ -45,7 +45,10 @@ function makeFixture() {
         name: "fixture-app",
         dependencies: { abap2UI5: "file:../run/input/core", express: "^5" },
       },
-      "../run/input/core": { name: "abap2UI5", version: "1.0.0" },
+      // Mirrors the real lock: the frozen core entry carries the core's own
+      // declared dependencies, which the assemble drift-guard checks against
+      // run/input/core/package.json.
+      "../run/input/core": { name: "abap2UI5", version: "1.0.0", dependencies: { "openui5-dist": "1.113.0" } },
       "node_modules/abap2UI5": { resolved: "../run/input/core", link: true },
       "node_modules/express": { version: "5.0.0", resolved: "https://registry.npmjs.org/express/-/express-5.0.0.tgz" },
     },
@@ -252,4 +255,17 @@ describe("assemble-cap guardrails", () => {
     expect(res.status).toBe(1);
     expect(res.stderr).toContain("still references run/input/core");
   });
+
+  test("fails when the mirrored core's dependencies drift from the frozen lock entry", () => {
+    root = makeFixture();
+    // The mirrored core adds a dependency that the frozen src lock entry
+    // (../run/input/core) does not know about — an npm-ci-breaking drift.
+    const corePkgPath = path.join(root, "run", "input", "core", "package.json");
+    const corePkg = readJson(corePkgPath);
+    corePkg.dependencies["some-new-dep"] = "^2.0.0";
+    writeJson(corePkgPath, corePkg);
+    const res = runAssemble(root);
+    expect(res.status).toBe(1);
+    expect(res.stderr).toContain("core dependencies drifted");
+  });
 });