test(shell): handle nullable exit metadata

Make the shell exit assertions typecheck cleanly while keeping the PowerShell regression coverage. Remove the accidentally committed .opencode package-lock so generated state does not ship in the branch.

packages/opencode/.opencode/package-lock.json

@@ -1,31 +0,0 @@
-{
-  "name": ".opencode",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "dependencies": {
-        "@opencode-ai/plugin": "*"
-      }
-    },
-    "node_modules/@opencode-ai/plugin": {
-      "version": "1.2.24",
-      "license": "MIT",
-      "dependencies": {
-        "@opencode-ai/sdk": "1.2.24",
-        "zod": "4.1.8"
-      }
-    },
-    "node_modules/@opencode-ai/sdk": {
-      "version": "1.2.24",
-      "license": "MIT"
-    },
-    "node_modules/zod": {
-      "version": "4.1.8",
-      "license": "MIT",
-      "funding": {
-        "url": "https://github.com/sponsors/colinhacks"
-      }
-    }
-  }
-}

packages/opencode/test/tool/shell.test.ts

@@ -155,7 +155,7 @@ describe("tool.shell", () => {
           },
           ctx,
         )
-        expect(result.metadata.exit).toBe(0)
+        expect(result.metadata.exit ?? -1).toBe(0)
         expect(result.metadata.output).toContain("test")
       },
     })
@@ -1005,7 +1005,7 @@ describe("tool.shell runtime", () => {
         )
         expect(result.output).toContain("333")
         expect(result.output).toContain("444")
-        expect(result.metadata.exit).toBe(0)
+        expect(result.metadata.exit ?? -1).toBe(0)
       },
     })
   })
@@ -1022,7 +1022,7 @@ describe("tool.shell runtime", () => {
           },
           ctx,
         )
-        expect(result.metadata.exit).toBe(42)
+        expect(result.metadata.exit ?? -1).toBe(42)
       },
     })
   })
@@ -1039,7 +1039,7 @@ describe("tool.shell runtime", () => {
           },
           ctx,
         )
-        expect(result.metadata.exit).toBe(42)
+        expect(result.metadata.exit ?? -1).toBe(42)
       },
     })
   })
@@ -1056,7 +1056,7 @@ describe("tool.shell runtime", () => {
           },
           ctx,
         )
-        expect(result.metadata.exit).toBe(1)
+        expect(result.metadata.exit ?? -1).toBe(1)
       },
     })
   })