diigo-cache: lint typechecks the program scripts

scripts/tsconfig.json gives scripts/ node's types (@types/node, a new
devDependency) and allows the .ts import specifiers node's type
stripping needs; the worker's tsconfig still keeps node's types out.
pnpm lint runs it.

Generated-by: Claude Opus 5.5

diigo-cache/scripts/tsconfig.json

@@ -0,0 +1,11 @@
+{
+	// program scripts run under node (type stripping), so they get node's
+	// types; the worker's own tsconfig keeps them out
+	"extends": "../tsconfig.json",
+	"compilerOptions": {
+		"types": ["node"],
+		"lib": ["ES2022", "ESNext.Disposable"],
+		"allowImportingTsExtensions": true
+	},
+	"include": ["./**/*.ts", "../src/rss.ts", "../src/items.ts"]
+}