diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index b77bef3..fce3fa5 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -1,5 +1,6 @@
-# CI — syntax check, server tests (node:test), client tests (Vitest), Vite build.
-# Runs on every push and pull request so no change lands unverified.
+# CI — the FULL quality gate, so no change lands unverified: formatting,
+# lint (client + server), typecheck (client + server), server syntax check,
+# server + client tests, and the Vite build.
 #
 # Forgejo Actions reads .forgejo/workflows/. The container image matches the
 # Dockerfile runtime (node:22) so better-sqlite3 prebuilds resolve identically.
@@ -22,6 +23,18 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Format check (Prettier)
+        run: npm run format:check
+
+      - name: Lint (client + server)
+        run: npm run lint
+
+      - name: Typecheck (client)
+        run: npm run typecheck
+
+      - name: Typecheck (server)
+        run: npm run typecheck:server
+
       - name: Syntax check (server)
         run: npm run check:server
 
diff --git a/knip.json b/knip.json
new file mode 100644
index 0000000..ba4412a
--- /dev/null
+++ b/knip.json
@@ -0,0 +1,23 @@
+{
+  "$schema": "https://unpkg.com/knip@6/schema.json",
+  "entry": [
+    "server.cts",
+    "client/main.tsx",
+    "workers/**/*.cts",
+    "scripts/*.{cts,js}",
+    "setup/*.cts",
+    "db/migrations/*.cts",
+    "tests/**/*.test.js",
+    "client/**/*.test.ts",
+    "e2e/**/*.{js,spec.js}",
+    "eslint.config.mjs",
+    "vite.config.mjs"
+  ],
+  "project": [
+    "client/**/*.{ts,tsx}",
+    "{routes,services,middleware,db,workers,utils,setup}/**/*.cts",
+    "server.cts"
+  ],
+  "ignore": ["client/components/ui/**", "types/**"],
+  "ignoreExportsUsedInFile": true
+}
diff --git a/lefthook.yml b/lefthook.yml
new file mode 100644
index 0000000..1cb7b78
--- /dev/null
+++ b/lefthook.yml
@@ -0,0 +1,20 @@
+# Local fast enforcement so violations never reach CI.
+# Installed via the `prepare` script (`lefthook install`) on `npm install`.
+
+pre-commit:
+  parallel: false
+  jobs:
+    - name: format
+      glob: '*.{ts,tsx,cts,mts,js,jsx,json,md,css,yml,yaml}'
+      run: npx prettier --write {staged_files}
+      stage_fixed: true
+    - name: lint
+      run: npm run lint
+
+pre-push:
+  parallel: true
+  jobs:
+    - name: typecheck-client
+      run: npm run typecheck
+    - name: typecheck-server
+      run: npm run typecheck:server
diff --git a/package-lock.json b/package-lock.json
index bad565b..b39b252 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -65,6 +65,8 @@
         "eslint-plugin-react-refresh": "^0.4.26",
         "globals": "^17.7.0",
         "jsdom": "^29.1.1",
+        "knip": "^6.24.0",
+        "lefthook": "^2.1.9",
         "postcss": "^8.4.47",
         "prettier": "3.9.4",
         "tailwindcss": "^3.4.14",
@@ -2902,6 +2904,406 @@
         "@otplib/core": "13.4.1"
       }
     },
+    "node_modules/@oxc-parser/binding-android-arm-eabi": {
+      "version": "0.137.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-android-arm-eabi/-/binding-android-arm-eabi-0.137.0.tgz",
+      "integrity": "sha512-KDs+0VPdEmasOkpuJHW9V5WCF+cvYdMQv2Jd+aJXt+cxIx12NToRQRbXaRwUEDsZw+/jMk81Ve8ZFbjUkJTOwA==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-android-arm64": {
+      "version": "0.137.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-android-arm64/-/binding-android-arm64-0.137.0.tgz",
+      "integrity": "sha512-WhALNzfy3x/RfC6bsqX+csavuUY0yHHE7XfgPE5M542uhoBZUUoGTPG+nkMbGoG4+gcfss5s7urMyn5QBHu0sw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-darwin-arm64": {
+      "version": "0.137.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-darwin-arm64/-/binding-darwin-arm64-0.137.0.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-darwin-x64": {
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+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-darwin-x64/-/binding-darwin-x64-0.137.0.tgz",
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+        "x64"
+      ],
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
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+      "license": "MIT",
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+      ],
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+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-wasm32-wasi/-/binding-wasm32-wasi-0.137.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "optional": true,
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+      }
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+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
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+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-0.137.0.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-win32-ia32-msvc": {
+      "version": "0.137.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-win32-ia32-msvc/-/binding-win32-ia32-msvc-0.137.0.tgz",
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+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-win32-x64-msvc": {
+      "version": "0.137.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-win32-x64-msvc/-/binding-win32-x64-msvc-0.137.0.tgz",
+      "integrity": "sha512-2AsevxlvNN4WKxpEn3RtqD5zbqMaXF+T7JXblsP4gVuY+vC9dXS4ED/PwfRCliFqoeisYS3Iro4DHzxr0TEvVA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
     "node_modules/@oxc-project/types": {
       "version": "0.133.0",
       "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.133.0.tgz",
@@ -2912,6 +3314,335 @@
         "url": "https://github.com/sponsors/Boshen"
       }
     },
+    "node_modules/@oxc-resolver/binding-android-arm-eabi": {
+      "version": "11.21.3",
+      "resolved": "https://registry.npmjs.org/@oxc-resolver/binding-android-arm-eabi/-/binding-android-arm-eabi-11.21.3.tgz",
+      "integrity": "sha512-eNU11A2WNizh04v3uyaJCootrHIaS0B9aHYXvAvVnPNk4xYSjMUjHnhQ6dewPN2MRYDskV85d1N0Aw0WNWhcyg==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ]
+    },
+    "node_modules/@oxc-resolver/binding-android-arm64": {
+      "version": "11.21.3",
+      "resolved": "https://registry.npmjs.org/@oxc-resolver/binding-android-arm64/-/binding-android-arm64-11.21.3.tgz",
+      "integrity": "sha512-8Q+ZjTLvn2dIcWsrmhdrEihm7q+ag/k+mkry7Z+t0QbbHaVxXQfvH9AewyVMh/WrpEKhQ3DDgx9fYbqeCpeOEw==",
+      "cpu": [
+        "arm64"
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+      "optional": true,
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+      ]
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+      "license": "MIT",
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+        "freebsd"
+      ]
+    },
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+      "dev": true,
+      "license": "MIT",
+      "optional": true,
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+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/lefthook-openbsd-arm64": {
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+      "resolved": "https://registry.npmjs.org/lefthook-openbsd-arm64/-/lefthook-openbsd-arm64-2.1.9.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ]
+    },
+    "node_modules/lefthook-openbsd-x64": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/lefthook-openbsd-x64/-/lefthook-openbsd-x64-2.1.9.tgz",
+      "integrity": "sha512-PmPoMmLP/wQQWcQ9u2YH86bTZ3UCfBsxuEmVTEyPU2U8R1qSTp5r/Gs3G8cN5Mxo91XB9oBERtF1n+xD3W6aVA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ]
+    },
+    "node_modules/lefthook-windows-arm64": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/lefthook-windows-arm64/-/lefthook-windows-arm64-2.1.9.tgz",
+      "integrity": "sha512-KphfkBKmwBnmolyrdhIl3lrBaOyTcCgXBT2AB/9OHnEXhOLvv5uTCUkrD4YRAxXPtFKq6UvnapIeoL3GZq0bdA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
+    "node_modules/lefthook-windows-x64": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/lefthook-windows-x64/-/lefthook-windows-x64-2.1.9.tgz",
+      "integrity": "sha512-2qlUtkJHZ3MyUxgV5XTEmcrIoNZA07iwaquoswAcqv/1MeBFXlD+O+koFRfrzWng2O5WYEbpJnd8tvaYnV8fTA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
     "node_modules/leven": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/leven/-/leven-3.1.0.tgz",
@@ -10747,6 +11773,85 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/oxc-parser": {
+      "version": "0.137.0",
+      "resolved": "https://registry.npmjs.org/oxc-parser/-/oxc-parser-0.137.0.tgz",
+      "integrity": "sha512-yFImD+WLElJpLKy8llG1qe4DCmMsL18peRp8XP1JKfig/gISbJkglnpDtX2aTmAn10kZF7164HbN2H8QPsXxGg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@oxc-project/types": "^0.137.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      },
+      "optionalDependencies": {
+        "@oxc-parser/binding-android-arm-eabi": "0.137.0",
+        "@oxc-parser/binding-android-arm64": "0.137.0",
+        "@oxc-parser/binding-darwin-arm64": "0.137.0",
+        "@oxc-parser/binding-darwin-x64": "0.137.0",
+        "@oxc-parser/binding-freebsd-x64": "0.137.0",
+        "@oxc-parser/binding-linux-arm-gnueabihf": "0.137.0",
+        "@oxc-parser/binding-linux-arm-musleabihf": "0.137.0",
+        "@oxc-parser/binding-linux-arm64-gnu": "0.137.0",
+        "@oxc-parser/binding-linux-arm64-musl": "0.137.0",
+        "@oxc-parser/binding-linux-ppc64-gnu": "0.137.0",
+        "@oxc-parser/binding-linux-riscv64-gnu": "0.137.0",
+        "@oxc-parser/binding-linux-riscv64-musl": "0.137.0",
+        "@oxc-parser/binding-linux-s390x-gnu": "0.137.0",
+        "@oxc-parser/binding-linux-x64-gnu": "0.137.0",
+        "@oxc-parser/binding-linux-x64-musl": "0.137.0",
+        "@oxc-parser/binding-openharmony-arm64": "0.137.0",
+        "@oxc-parser/binding-wasm32-wasi": "0.137.0",
+        "@oxc-parser/binding-win32-arm64-msvc": "0.137.0",
+        "@oxc-parser/binding-win32-ia32-msvc": "0.137.0",
+        "@oxc-parser/binding-win32-x64-msvc": "0.137.0"
+      }
+    },
+    "node_modules/oxc-parser/node_modules/@oxc-project/types": {
+      "version": "0.137.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.137.0.tgz",
+      "integrity": "sha512-WT+Gb24i8hmvo85AIv2oEYouEXkRlKAlT9WaCa3TfLgNCN+GhrJOGZuIlMouAh38Qe4QOx26eUOVsq70qXrywA==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      }
+    },
+    "node_modules/oxc-resolver": {
+      "version": "11.21.3",
+      "resolved": "https://registry.npmjs.org/oxc-resolver/-/oxc-resolver-11.21.3.tgz",
+      "integrity": "sha512-2Mx3fKQz7+xgrBONjsxOgCGtMHOn38/HxMzW1I5efwXB5a4lRN0Vp40gYUJFBWJslcrvwoofTrqoTnLbwTd3pA==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      },
+      "optionalDependencies": {
+        "@oxc-resolver/binding-android-arm-eabi": "11.21.3",
+        "@oxc-resolver/binding-android-arm64": "11.21.3",
+        "@oxc-resolver/binding-darwin-arm64": "11.21.3",
+        "@oxc-resolver/binding-darwin-x64": "11.21.3",
+        "@oxc-resolver/binding-freebsd-x64": "11.21.3",
+        "@oxc-resolver/binding-linux-arm-gnueabihf": "11.21.3",
+        "@oxc-resolver/binding-linux-arm-musleabihf": "11.21.3",
+        "@oxc-resolver/binding-linux-arm64-gnu": "11.21.3",
+        "@oxc-resolver/binding-linux-arm64-musl": "11.21.3",
+        "@oxc-resolver/binding-linux-ppc64-gnu": "11.21.3",
+        "@oxc-resolver/binding-linux-riscv64-gnu": "11.21.3",
+        "@oxc-resolver/binding-linux-riscv64-musl": "11.21.3",
+        "@oxc-resolver/binding-linux-s390x-gnu": "11.21.3",
+        "@oxc-resolver/binding-linux-x64-gnu": "11.21.3",
+        "@oxc-resolver/binding-linux-x64-musl": "11.21.3",
+        "@oxc-resolver/binding-openharmony-arm64": "11.21.3",
+        "@oxc-resolver/binding-wasm32-wasi": "11.21.3",
+        "@oxc-resolver/binding-win32-arm64-msvc": "11.21.3",
+        "@oxc-resolver/binding-win32-x64-msvc": "11.21.3"
+      }
+    },
     "node_modules/p-limit": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
@@ -11800,6 +12905,16 @@
         "node": ">=4"
       }
     },
+    "node_modules/resolve-pkg-maps": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
+      "integrity": "sha512-seS2Tj26TBVOC2NIc2rOe2y2ZO7efxITtLZcGSOnHHNOQ7CkiUBfw0Iw2ck6xkIhPwLhKNLS8BO+hEpngQlqzw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
+      }
+    },
     "node_modules/reusify": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
@@ -12354,6 +13469,19 @@
         "node": ">=20.0.0"
       }
     },
+    "node_modules/smol-toml": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/smol-toml/-/smol-toml-1.7.0.tgz",
+      "integrity": "sha512-aqVvWoyO21L23mb+drl4RmMXbf6N7FdHjAhTRA9ZBL7apWBgfWC16KjrASI+1p9GAroljyMHj6fK67i0UiTNvQ==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/cyyynthia"
+      }
+    },
     "node_modules/sonner": {
       "version": "1.7.4",
       "resolved": "https://registry.npmjs.org/sonner/-/sonner-1.7.4.tgz",
@@ -13213,6 +14341,16 @@
         "typescript": ">=4.8.4 <6.1.0"
       }
     },
+    "node_modules/unbash": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/unbash/-/unbash-4.0.2.tgz",
+      "integrity": "sha512-8gwNZ29+0/3zmXw7ToIHZtg6wK37xnniRUdBt7B27xZxaxfgR5tGMaGHT0t0dLtBV9fXE7zurh0s6Z1DHVjfWg==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/unbox-primitive": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.1.0.tgz",
@@ -13757,6 +14895,16 @@
         "node": ">=18"
       }
     },
+    "node_modules/walk-up-path": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/walk-up-path/-/walk-up-path-4.0.0.tgz",
+      "integrity": "sha512-3hu+tD8YzSLGuFYtPRb48vdhKMi0KQV5sn+uWr8+7dMEq/2G/dtLrdDinkLjqq5TIbIBjYJ4Ax/n3YiaW7QM8A==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
     "node_modules/webidl-conversions": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
@@ -14241,6 +15389,22 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/yaml": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.0.tgz",
+      "integrity": "sha512-2AvhNX3mb8zd6Zy7INTtSpl1F15HW6Wnqj0srWlkKLcpYl/gMIMJiyuGq2KeI2YFxUPjdlB+3Lc10seMLtL4cA==",
+      "devOptional": true,
+      "license": "ISC",
+      "bin": {
+        "yaml": "bin.mjs"
+      },
+      "engines": {
+        "node": ">= 14.6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/eemeli"
+      }
+    },
     "node_modules/yargs": {
       "version": "17.7.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
@@ -14282,6 +15446,16 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
+    },
+    "node_modules/zod": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
+      "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 8626061..31150c6 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,9 @@
     "test:e2e:update": "node e2e/setup/prepare-db.js && playwright test --project=chromium-desktop --project=chromium-mobile --update-snapshots",
     "test:e2e:probe": "node e2e/setup/prepare-db.js && playwright test --project=probe",
     "smoke:prod": "bash scripts/prod-smoke.sh",
+    "knip": "knip",
     "ci": "npm run format:check && npm run lint && npm run typecheck && npm run typecheck:server && npm run check:server && npm run test:all && npm run build",
+    "prepare": "lefthook install",
     "start": "node server.cts"
   },
   "dependencies": {
@@ -86,6 +88,8 @@
     "eslint-plugin-react-refresh": "^0.4.26",
     "globals": "^17.7.0",
     "jsdom": "^29.1.1",
+    "knip": "^6.24.0",
+    "lefthook": "^2.1.9",
     "postcss": "^8.4.47",
     "prettier": "3.9.4",
     "tailwindcss": "^3.4.14",