fix(release): sdk-playground version + pin Docker bun + skip private in verify

- Add missing version field to sdk-playground/package.json (broke pnpm pack)
- Skip private packages in verify-packed-manifests (prevent recurrence)
- Pin bun v1.3.13 in Dockerfile.test (1.3.14 produces different lockfile)

Dockerfile.test

@@ -66,7 +66,7 @@ RUN npx --yes @puppeteer/browsers install chrome-headless-shell@148.0.7778.167 \
 WORKDIR /app
 
 # Install bun
-RUN curl -fsSL https://bun.sh/install | bash
+RUN curl -fsSL https://bun.sh/install | BUN_INSTALL="/root/.bun" bash -s "bun-v1.3.13"
 ENV PATH="/root/.bun/bin:$PATH"
 
 # Install dependencies (full, including devDependencies for tsx + test harness)

packages/sdk-playground/package.json

@@ -1,5 +1,6 @@
 {
   "name": "@hyperframes/sdk-playground",
+  "version": "0.6.99",
   "private": true,
   "type": "module",
   "scripts": {

scripts/verify-packed-manifests.mjs

@@ -43,6 +43,7 @@ function main() {
     const sourcePackageJson = JSON.parse(
       readFileSync(join(ROOT, workspace, "package.json"), "utf8"),
     );
+    if (sourcePackageJson.private) continue;
     if (listWorkspaceRefs(sourcePackageJson).length === 0) continue;
 
     const packDir = mkdtempSync(join(tmpdir(), "hyperframes-pack-"));