chore: add quality gates (P1) (#7)

* chore: add quality gates — coverage thresholds, publint/attw, biome, renovate

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: update biome.json for v2.4 compatibility + auto-fix lint

Schema 2.0.6→2.4.5, organizeImports→assist, include→includes.
Applied biome auto-fixes (import sorting, formatting).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: restore reconnecting property removed by biome unsafe fix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: use conditional exports for proper CJS/ESM type resolution

Fixes FalseCJS error from @arethetypeswrong/cli.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: brmn

.github/workflows/ci.yml

@@ -20,5 +20,8 @@ jobs:
           cache: npm
       - run: npm ci
       - run: npm run typecheck
+      - run: npm run lint
       - run: npm run test:unit
       - run: npm run build
+      - run: npx publint
+      - run: npx @arethetypeswrong/cli --pack .

biome.json

@@ -0,0 +1,37 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.4.5/schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "assist": {
+    "actions": {
+      "source": {
+        "organizeImports": "on"
+      }
+    }
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "correctness": {
+        "noUnusedImports": "warn",
+        "noUnusedVariables": "warn"
+      },
+      "style": {
+        "noDefaultExport": "warn"
+      }
+    }
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 120
+  },
+  "files": {
+    "includes": ["src/**/*.ts", "test/**/*.ts"]
+  }
+}