T01.i: bring examples/notebook into the pnpm workspace, fix its type error

pnpm-workspace.yaml listed only packages/*, so pnpm never installed
examples/notebook's dependencies even though root package.json's
workspaces field named examples/* too; the example ran on a stray
node_modules a manual bun install had left behind (symlinks into
node_modules/.bun, including a dangling @ng-eventually/sdk link to a
package that no longer exists). Added examples/* to pnpm-workspace.yaml
and reinstalled; examples/notebook now resolves @ng-org/orm and
@ng-org/web to the exact same pnpm store instances packages/polyfill
uses (verified via the symlinks and node_modules/.pnpm listing) - no
package ended up duplicated.

That alone did not fix the example's TS2345: NoteShape's object
literal had its dataTypes[].valType widened from the "iri"/"string"
literals to plain string (no satisfies clause), which the existing
test suite already guards against elsewhere (satisfies
ShapeType<BaseType>). Applied the same pattern here, importing the
already re-exported ShapeType/BaseType from @ng-eventually/polyfill -
no new dependency needed, no compiler option touched.

pnpm-lock.yaml

@@ -18,6 +18,18 @@ importers:
         specifier: ^5.6.0
         version: 5.9.3
 
+  examples/notebook:
+    dependencies:
+      '@ng-eventually/polyfill':
+        specifier: workspace:*
+        version: link:../../packages/polyfill
+      '@ng-org/orm':
+        specifier: 0.1.2-alpha.21
+        version: 0.1.2-alpha.21
+      '@ng-org/web':
+        specifier: 0.1.2-alpha.14
+        version: 0.1.2-alpha.14
+
   packages/ng-e2e-helpers:
     devDependencies:
       '@ng-org/web':