chore: harden release checks and package coverage

scripts/check-public-api.mjs

@@ -2,10 +2,15 @@ import { existsSync, readFileSync, readdirSync, writeFileSync } from "node:fs";
 import console from "node:console";
 import { dirname, join, relative, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
+import { createRequire } from "node:module";
 import process from "node:process";
-import ts from "typescript";
 
 const root = resolve(dirname(fileURLToPath(import.meta.url)), "..");
+const require = createRequire(import.meta.url);
+// TypeScript 7's root package is the native CLI and no longer exposes the
+// legacy compiler API. Public API extraction intentionally uses the compiler
+// version embedded by @wrnexus/typecheck.
+const ts = require(join(root, "packages", "typecheck", "node_modules", "typescript"));
 const baselinePath = join(root, "docs", "public-api-0.8.json");
 
 function flattenTargets(value) {