Fix test type errors and update to JSR package (#217)

- Import isInlineContainer type guard from @runt/schema
- Use proper type checking for MediaContainer union types
- Replace unsafe direct property access with type guard checks
- Add specific type assertion for known test data structure
- Update package.json to use jsr:@runt/schema@^0.6.3
- All 60 tests passing ✅
- No TypeScript errors ✅

Rationale for type assertion:
The test creates a specific data structure (largeData) and verifies
it comes back correctly. The type assertion documents the expected
structure that we know we put in, making the test more readable
and type-safe than using 'as any'.

Author: rgbkrk

package.json

@@ -60,7 +60,7 @@
     "@radix-ui/react-separator": "^1.1.7",
     "@radix-ui/react-slot": "^1.2.3",
     "@radix-ui/react-tooltip": "^1.1.6",
-    "@runt/schema": "github:runtimed/runt#b2f5f1264cd1ddf51c881192aef6791a968f2b8b&path:/packages/schema",
+    "@runt/schema": "jsr:^0.6.3",
     "@tanstack/react-virtual": "^3.13.12",
     "@types/react-syntax-highlighter": "^15.5.13",
     "@uiw/codemirror-theme-github": "^4.23.14",

pnpm-lock.yaml

@@ -6,7 +6,7 @@ import {
 } from "./setup.js";
 import { makeAdapter } from "@livestore/adapter-node";
 import { createStorePromise } from "@livestore/livestore";
-import { events, schema, Store, tables } from "@runt/schema";
+import { events, schema, Store, tables, isInlineContainer } from "@runt/schema";
 
 console.log("🧪 Starting Anode edge case test suite...");
 
@@ -254,12 +254,20 @@ describe("Edge Cases and Stress Tests", () => {
 
       const outputs = store.query(tables.outputs.select().where({ cellId }));
       expect(outputs).toHaveLength(1);
-      expect(
-        outputs[0].representations["application/json"].data.text
-      ).toHaveLength(1024 * 1024);
-      expect(
-        outputs[0].representations["application/json"].data.metadata.size
-      ).toBe(1024 * 1024);
+
+      const representation = outputs[0].representations!["application/json"];
+      expect(representation).toBeDefined();
+
+      if (isInlineContainer(representation)) {
+        const data = representation.data as {
+          text: string;
+          metadata: { size: number; type: string };
+        };
+        expect(data.text).toHaveLength(1024 * 1024);
+        expect(data.metadata.size).toBe(1024 * 1024);
+      } else {
+        throw new Error("Expected inline container but got artifact container");
+      }
     });
 
     it("should handle unicode and special characters in all text fields", async () => {