Adopt the verified Ultracite lint baseline

PROJECT_STATUS.md

@@ -16,9 +16,16 @@ maintenance-first support.
 - Vite + React 19 SPA, Hono Worker, Cloudflare D1 + Drizzle, Cloudflare R2,
   better-auth Google OAuth, and optional AI providers. D1 is authoritative;
   the retired Turso database was deleted on 2026-08-02.
+- Ultracite 7.10.2 is an exact development-only Biome preset dependency. Local
+  exceptions preserve Reader's established SPA, Worker, Astro, and document
+  processing style without affecting runtime behavior.
 
 ## Timeline
 
+- **2026-08-09:** Adopted the verified Ultracite-backed Biome baseline through
+  the existing non-writing check, with explicit compatibility exceptions and
+  no source rewrite, production dependency, storage/auth/AI, migration, or
+  deployment change.
 - **2026-07-31:** Kept the public sitemap limited to the four canonical HTML
   pages while retaining six machine resources through robots, llms, and the
   agent catalog. Explicit tests now enforce sitemap, catalog, and Markdown
@@ -42,6 +49,8 @@ maintenance-first support.
 - Account-backed and device-local capture paths.
 - Owned editorial product changelog at `/changelog`.
 - HTML-only public sitemap with cataloged Markdown mirrors for agent discovery.
+- Exact Ultracite-backed Biome presets with explicit local compatibility
+  exceptions; `pnpm check` remains non-writing.
 
 ## Work queue
 

biome.json

@@ -1,10 +1,14 @@
 {
   "$schema": "https://biomejs.dev/schemas/2.5.5/schema.json",
+  "extends": [
+    "ultracite/biome/core",
+    "ultracite/biome/react",
+    "ultracite/biome/vitest"
+  ],
   "vcs": { "enabled": true, "clientKind": "git", "useIgnoreFile": true },
   "files": {
     "ignoreUnknown": true,
     "includes": [
-      "**",
       "!**/.next",
       "!**/.open-next",
       "!**/.wrangler",
@@ -31,8 +35,11 @@
     "lineEnding": "lf"
   },
   "css": {
+    "formatter": { "enabled": false },
     "parser": { "tailwindDirectives": true }
   },
+  "html": { "formatter": { "enabled": false } },
+  "json": { "formatter": { "enabled": false } },
   "javascript": {
     "formatter": {
       "quoteStyle": "single",
@@ -46,6 +53,7 @@
     "rules": {
       "preset": "recommended",
       "a11y": {
+        "noNoninteractiveElementInteractions": "off",
         "useAltText": "off",
         "useValidAnchor": "off",
         "useButtonType": "off",
@@ -60,19 +68,92 @@
         "useSemanticElements": "off"
       },
       "correctness": {
+        "noGlobalDirnameFilename": "off",
         "noInnerDeclarations": "off",
+        "noUnusedImports": "warn",
+        "noUnusedVariables": "warn",
+        "useImageSize": "off",
+        "useParseIntRadix": "off",
         "useExhaustiveDependencies": "warn"
       },
       "suspicious": {
+        "noAlert": "off",
         "noArrayIndexKey": "warn",
+        "noBitwiseOperators": "off",
+        "noConfusingVoidType": "off",
         "noThenProperty": "warn",
         "noControlCharactersInRegex": "warn",
-        "useIterableCallbackReturn": "warn"
+        "noEmptyBlockStatements": "off",
+        "noEqualsToNull": "off",
+        "noExplicitAny": "off",
+        "noLeakedRender": "off",
+        "noNestedPromises": "off",
+        "noReactForwardRef": "off",
+        "noShadow": "off",
+        "noSkippedTests": "off",
+        "noUnnecessaryConditions": "off",
+        "useAwait": "off",
+        "useErrorMessage": "off",
+        "useIterableCallbackReturn": "warn",
+        "useStaticResponseMethods": "off"
+      },
+      "complexity": {
+        "noExcessiveCognitiveComplexity": "off",
+        "noForEach": "off",
+        "noUselessUndefined": "off",
+        "noVoid": "off",
+        "useLiteralKeys": "off",
+        "useOptionalChain": "off",
+        "useSimplifiedLogicExpression": "off"
+      },
+      "nursery": { "useSortedClasses": "off" },
+      "performance": {
+        "noAwaitInLoops": "off",
+        "noDelete": "off",
+        "noJsxPropsBind": "off",
+        "noNamespaceImport": "off",
+        "useTopLevelRegex": "off"
       },
       "security": {
         "noDangerouslySetInnerHtml": "warn"
+      },
+      "style": {
+        "noExportedImports": "off",
+        "noIncrementDecrement": "off",
+        "noNegationElse": "off",
+        "noNestedTernary": "off",
+        "noNonNullAssertion": "off",
+        "noUnusedTemplateLiteral": "off",
+        "useAtIndex": "off",
+        "useBlockStatements": "off",
+        "useCollapsedIf": "off",
+        "useConsistentArrayType": "off",
+        "useConsistentArrowReturn": "off",
+        "useConsistentMethodSignatures": "off",
+        "useConsistentTypeDefinitions": "off",
+        "useDefaultSwitchClause": "off",
+        "useDestructuring": "off",
+        "useFilenamingConvention": "off",
+        "useNodejsImportProtocol": "off",
+        "useNumberNamespace": "off",
+        "useNumericSeparators": "off",
+        "useSelfClosingElements": "off",
+        "useShorthandAssign": "off",
+        "useTemplate": "off"
       }
     }
   },
-  "assist": { "enabled": true, "actions": { "source": { "organizeImports": "off" } } }
+  "assist": {
+    "enabled": true,
+    "actions": {
+      "source": {
+        "organizeImports": "off",
+        "useSortedAttributes": "off",
+        "useSortedInterfaceMembers": "off",
+        "useSortedKeys": "off",
+        "useSortedPackageJson": "off",
+        "useSortedProperties": "off"
+      }
+    }
+  }
 }

package.json

@@ -98,6 +98,7 @@
     "tailwindcss": "^4.3.3",
     "tsx": "4.23.1",
     "typescript": "6.0.3",
+    "ultracite": "7.10.2",
     "vite": "8.1.5",
     "vitest": "4.1.10",
     "wrangler": "4.114.0"