chore(build): harden turbo cache boundaries and outputs to prevent stale deployments

- Add globalDependencies: .env, .env.*, tsconfig.json
- Add env array with NEXT_PUBLIC_* for build task
- Expand outputs to include build/**
- Add outputs for lint/typecheck/test tasks

Fixes: Cache poisoning issue (stale code deployment)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

turbo.json

@@ -1,23 +1,42 @@
 {
   "$schema": "https://turbo.build/schema.json",
-  "globalDependencies": ["**/.env.*local"],
+  "globalDependencies": [
+    ".env",
+    ".env.*",
+    ".env.*local",
+    "tsconfig.json",
+    "tsconfig.*.json"
+  ],
   "tasks": {
     "build": {
       "dependsOn": ["^build"],
-      "outputs": ["dist/**", ".next/**", "!.next/cache/**"]
+      "env": [
+        "NEXT_PUBLIC_API_URL",
+        "NEXT_PUBLIC_*",
+        "NODE_ENV"
+      ],
+      "outputs": [
+        ".next/**",
+        "!.next/cache/**",
+        "dist/**",
+        "build/**"
+      ]
     },
     "dev": {
       "cache": false,
       "persistent": true
     },
     "lint": {
-      "dependsOn": ["^build"]
+      "dependsOn": ["^build"],
+      "outputs": []
     },
     "typecheck": {
-      "dependsOn": ["^build"]
+      "dependsOn": ["^build"],
+      "outputs": []
     },
     "test": {
-      "dependsOn": ["build"]
+      "dependsOn": ["build"],
+      "outputs": ["coverage/**"]
     },
     "clean": {
       "cache": false