Update runt schema upsert fix (#216)

* Update @runt/schema to include upsert fixes

Use commit d360a01c14d76f638d9545b44487c17b9cafb8b4 which includes:
- onConflict handling for NotebookInitialized materializer
- onConflict handling for all other insert operations

This resolves UNIQUE constraint errors when multiple clients
(headless runtime + web client) initialize the same notebook.

* Update to use key-value notebook metadata approach

- Update @runt/schema to commit 305edf9 with key-value metadata
- Remove notebook initialization logic from Root.tsx
- Update NotebookViewer.tsx to use notebookMetadata table
- Update DebugPanel to display metadata as key-value pairs
- No more initialization race conditions or UNIQUE constraint errors
- Notebook metadata is set on-demand via notebookMetadataSet events

* Fix types and remove manual type assertions

- Use full commit hash to ensure proper cache invalidation
- Remove 'as Array<{ key: string; value: string }>' type assertions
- Import and use NotebookMetadataData type properly
- Fix readonly vs mutable type issues
- All types now properly inferred from schema

* Update @runt/schema to b2f5f12 with debug table rename

- Update to commit b2f5f1264cd1ddf51c881192aef6791a968f2b8b
- Includes rename of debugPin table to debug (removes dash from table name)
- Eliminates SQL compatibility issues with dashes in table names

* Fix tests to use notebookMetadata instead of notebook table

- Update edge-cases.test.ts to query metadata and find title
- Update execution-flow.test.ts to use metadataQuery$ and check metadata changes
- Keep existing notebookInitialized event calls (they work via materializer)
- All 60 tests now passing ✅

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": "jsr:^0.6.2",
+    "@runt/schema": "github:runtimed/runt#b2f5f1264cd1ddf51c881192aef6791a968f2b8b&path:/packages/schema",
     "@tanstack/react-virtual": "^3.13.12",
     "@types/react-syntax-highlighter": "^15.5.13",
     "@uiw/codemirror-theme-github": "^4.23.14",