Add lint/format toolchain and split CI into concurrent jobs

.github/workflows/ci.yml

@@ -6,8 +6,70 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.event_name == 'push' && github.sha || github.ref }}
+  cancel-in-progress: ${{ github.event_name != 'push' }}
+
 jobs:
-  check:
+  lint:
+    runs-on: ubuntu-latest
+    # TODO(CL-6802 stage 2): flip blocking after the mechanical fix batch
+    continue-on-error: true
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: "1.3.14"
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: bun-${{ hashFiles('bun.lock') }}
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Cache lint
+        uses: actions/cache@v4
+        with:
+          path: |
+            .eslintcache
+            node_modules/.cache/prettier
+          key: lint-${{ github.sha }}
+          restore-keys: |
+            lint-
+
+      - name: Lint
+        run: bun run lint
+
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: "1.3.14"
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: bun-${{ hashFiles('bun.lock') }}
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Typecheck
+        run: bun run typecheck
+
+  build-and-test:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -23,6 +85,12 @@ jobs:
         with:
           bun-version: "1.3.14"
 
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: bun-${{ hashFiles('bun.lock') }}
+
       # The runner image has no ripgrep, so the grep plugin silently exercised
       # its fallback walker and left the ripgrep path untested.
       - name: Install ripgrep
@@ -31,9 +99,6 @@ jobs:
       - name: Install dependencies
         run: bun install --frozen-lockfile
 
-      - name: Typecheck
-        run: bun run typecheck
-
       - name: Build
         run: bun run build
 

.gitignore

@@ -8,6 +8,7 @@ dist/
 .corbits/MEMORY.md
 .interchange/
 .cache/
+.eslintcache
 .pi
 .claude/settings.local.json
 .claude/worktrees

.prettierignore

@@ -0,0 +1,6 @@
+dist/
+vendor/
+.worktrees/
+scratch/
+node_modules/
+CHANGELOG.md

.prettierrc.json

@@ -0,0 +1,5 @@
+{
+  "semi": true,
+  "trailingComma": "all",
+  "printWidth": 100
+}

AGENTS.md

@@ -38,11 +38,11 @@ When refactoring replaces an old path, delete the old one. No back-compat shims,
 ## Build & Validation
 
 ```bash
-bun run typecheck
-bun run build
-bun run test
+bun run check
 ```
 
+`bun run check` is the single pre-PR gate: it runs `lint`, `typecheck`, `build`, and `test`, in that order, matching CI.
+
 Run the full suite before declaring any task complete. Do not substitute individual targets. If a failure is pre-existing and unrelated to your change, say so explicitly.
 
 `bun run test` runs `bun test ./src ./tests ./evals`. A bare `bun test` also

eslint.config.js

@@ -0,0 +1,39 @@
+import js from "@eslint/js";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  {
+    ignores: [
+      "dist/**",
+      "vendor/**",
+      ".worktrees/**",
+      "**/.worktrees/**",
+      ".scratch/**",
+      "**/.scratch/**",
+      "scratch/**",
+      "**/scratch/**",
+      "node_modules/**",
+      "**/node_modules/**",
+    ],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.strict,
+  ...tseslint.configs.stylistic,
+  {
+    linterOptions: {
+      noInlineConfig: true,
+      reportUnusedDisableDirectives: "error",
+    },
+    rules: {
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          args: "all",
+          argsIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+          caughtErrorsIgnorePattern: "^_",
+        },
+      ],
+    },
+  },
+);

package.json

@@ -33,6 +33,8 @@
     "build:bin": "bun build ./src/index.ts --compile --minify --define process.env.NODE_ENV='\"production\"' --outfile ./dist/corbits && bun scripts/copy-repo-plugins.ts",
     "typecheck": "tsc --noEmit",
     "test": "bun test ./src ./tests ./evals",
+    "lint": "prettier --check --cache . && eslint --cache .",
+    "check": "bun run lint && bun run typecheck && bun run build && bun run test",
     "start": "bun run build && bun ./dist/index.js",
     "eval:capability": "bun scripts/eval-capability.ts",
     "eval:public-swe-one": "bun scripts/eval-public-swe-one.ts",
@@ -79,9 +81,13 @@
     "solid-js": "1.9.14"
   },
   "devDependencies": {
+    "@eslint/js": "^9.39.0",
     "@intx/inference-testing": "0.2.2",
     "@types/bun": "1.3.9",
+    "eslint": "^9.39.0",
+    "prettier": "^3.6.2",
     "typescript": "5.9.3",
+    "typescript-eslint": "^8.46.4",
     "typescript-language-server": "^4.3.4",
     "ws": "^8.21.0"
   },

tsconfig.base.json

@@ -19,6 +19,7 @@
     "declarationMap": true,
 
     "composite": true,
+    "incremental": true,
     "module": "ESNext",
     "noEmit": true,