refactor: Migrate project from Deno to pnpm/Node

Replace Deno configs and workflows with pnpm/Node tooling Add
package.json, jsr.json, build.config.ts and pnpm-lock.yaml Remove
deno.json, deno.lock, Deno build scripts and workflow Move source files
into src/ and update imports and tests to vitest Add Test CI workflow
and adapt publish jobs for pnpm/node Update editor settings, tasks,
.gitignore and bump LICENSE year

build.config.ts

@@ -0,0 +1,5 @@
+import { defineBuildConfig } from "obuild/config";
+
+export default defineBuildConfig({
+  entries: ["mod.ts"],
+});