fix(engine): derive ENGINE_VERSION instead of hand-syncing it

Same root cause as the package-lock.json/dependency-range fixes already
pushed to this branch: ENGINE_VERSION was a hardcoded literal that
test/unit/engine-version.test.ts correctly caught as stale against this
release's package.json bump. See fix/release-please-lockfile-sync (#4179)
for the full story and verification.

Author: JSONbored

packages/gittensory-engine/src/version.ts

@@ -1,5 +1,14 @@
-/**
- * Published semver of `@jsonbored/gittensory-engine`. Keep in lockstep with `package.json` `version`
- * (enforced by `test/unit/engine-version.test.ts`).
- */
-export const ENGINE_VERSION = "0.1.0";
+import { readFileSync } from "node:fs";
+import { fileURLToPath, URL } from "node:url";
+
+// Read at runtime instead of a hand-synced literal -- works identically from src/version.ts
+// (source, under vitest) and dist/version.js (compiled output): package.json is always the
+// direct parent of both directories, and this is a plain file read, not a compile-time import,
+// so it isn't subject to tsconfig's rootDir: "src" restriction. URL imported explicitly from
+// node:url (not the ambient global) -- they've subtly diverged in this @types/node version
+// (Symbol.dispose on URLSearchParamsIterator), which fileURLToPath's overloads reject otherwise.
+const ownPackageJsonPath = fileURLToPath(new URL("../package.json", import.meta.url));
+const ownPackageJson = JSON.parse(readFileSync(ownPackageJsonPath, "utf8")) as { version: string };
+
+/** Published semver of `@jsonbored/gittensory-engine`, derived from this package's own package.json. */
+export const ENGINE_VERSION: string = ownPackageJson.version;

test/unit/gittensory-engine-scaffold.test.ts

@@ -7,7 +7,7 @@ import enginePkg from "../../packages/gittensory-engine/package.json";
 describe("gittensory-engine package scaffold", () => {
   it("declares the published package identity", () => {
     expect(enginePkg.name).toBe("@jsonbored/gittensory-engine");
-    expect(enginePkg.version).toBe("0.1.0");
+    expect(enginePkg.version).toMatch(/^\d+\.\d+\.\d+$/);
     expect(enginePkg.type).toBe("module");
     expect(enginePkg.license).toBe("AGPL-3.0-only");
     expect(enginePkg.publishConfig?.access).toBe("public");