add claude specific configuration and instruction

.claude/rules/testing.md

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+---
+paths: ["**/*.spec.ts", "**/*.type-spec.ts"]
+---
+
+# Test Conventions
+
+- **`*.spec.ts`** — runtime tests. Use Arrange/Act/Assert with `describe`/`it` blocks.
+- **`*.type-spec.ts`** — compile-time type tests. Use `expectTypeOf(x).toEqualTypeOf<T>()` from expect-type.
+- Tests live in `spec/` directories next to the module, one file per operation (e.g., `map.spec.ts`).
+- When adding a new method, create both a `*.spec.ts` and `*.type-spec.ts` for it.
+- Run runtime tests: `pnpm test -- src/{module}/spec/{file}.spec.ts`
+- Run type tests: `pnpm test:types`

.claude/settings.json

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+{
+  "permissions": {
+    "deny": [
+      "Read(.env*)",
+      "Read(**/*.pem)",
+      "Read(**/*.key)"
+    ]
+  },
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Write|Edit|MultiEdit",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "filepath=$(jq -r '.tool_input.file_path // .tool_input.path // empty' /dev/stdin) && [ -n \"$filepath\" ] && pnpm exec prettier --write \"$filepath\" 2>/dev/null && [[ \"$filepath\" =~ \\.(ts|tsx|js|jsx)$ ]] && pnpm exec eslint --fix \"$filepath\" 2>/dev/null || true",
+            "timeout": 25
+          }
+        ]
+      }
+    ]
+  }
+}