Add Husky pre-commit with eslint and Sentry env convention (M0).

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

@@ -22,3 +22,6 @@ DEMO_MODE=false
 
 # Feed recorder (NDJSON to data/)
 RECORD_FEED=false
+
+# Sentry — https://sentry.io (project: arbpulse)
+SENTRY_DSN=

.husky/pre-commit

@@ -0,0 +1 @@
+npx lint-staged

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "semi": true,
+  "singleQuote": false,
+  "trailingComma": "all",
+  "tabWidth": 2
+}

README.md

@@ -343,6 +343,13 @@ Eso no indica que el bot “no funcione”: indica que el filtro económico es e
 
 ---
 
+## Production practices
+
+- **Pre-commit:** Husky runs lint-staged (`eslint --fix`, `prettier --write`) on staged `*.ts` / `*.tsx` in `src/` and `web/src/`.
+- **Observability:** Sentry planned — set `SENTRY_DSN` in `.env` after creating the `arbpulse` project in Sentry.
+
+---
+
 ## Licencia
 
 MIT — ver archivo `LICENSE` cuando se añada al repositorio.

eslint.config.mjs

@@ -0,0 +1,31 @@
+import eslint from "@eslint/js";
+import reactHooks from "eslint-plugin-react-hooks";
+import globals from "globals";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  { ignores: ["web/dist/**", "data/**", "**/node_modules/**"] },
+  {
+    files: ["src/**/*.ts"],
+    extends: [eslint.configs.recommended, ...tseslint.configs.recommended],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: "module",
+      globals: globals.node,
+    },
+  },
+  {
+    files: ["web/src/**/*.{ts,tsx}"],
+    extends: [eslint.configs.recommended, ...tseslint.configs.recommended],
+    plugins: { "react-hooks": reactHooks },
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: "module",
+      globals: globals.browser,
+      parserOptions: { ecmaFeatures: { jsx: true } },
+    },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+    },
+  },
+);

package.json

@@ -12,7 +12,19 @@
     "start": "tsx src/index.ts",
     "build": "npm --prefix web install && npm --prefix web run build",
     "typecheck": "tsc --noEmit && npm --prefix web run typecheck",
-    "test": "node scripts/run-tests.mjs"
+    "test": "node scripts/run-tests.mjs",
+    "lint": "eslint .",
+    "prepare": "husky"
+  },
+  "lint-staged": {
+    "src/**/*.ts": [
+      "eslint --fix",
+      "prettier --write"
+    ],
+    "web/src/**/*.{ts,tsx}": [
+      "eslint --fix",
+      "prettier --write"
+    ]
   },
   "dependencies": {
     "express": "^4.21.2",
@@ -21,11 +33,19 @@
     "ws": "^8.18.0"
   },
   "devDependencies": {
+    "@eslint/js": "^9.18.0",
     "@types/express": "^4.17.21",
     "@types/node": "^22.10.5",
     "@types/swagger-ui-express": "^4.1.8",
     "@types/ws": "^8.5.13",
+    "eslint": "^9.18.0",
+    "eslint-plugin-react-hooks": "^5.1.0",
+    "globals": "^15.14.0",
+    "husky": "^9.1.7",
+    "lint-staged": "^16.4.0",
     "openapi-types": "^12.1.3",
-    "typescript": "^5.7.3"
+    "prettier": "^3.8.3",
+    "typescript": "^5.7.3",
+    "typescript-eslint": "^8.26.0"
   }
 }