Fix release tarball discovery

[Keesan12]

Summary

• discover npm pack artifacts from the output directory instead of optional JSON metadata
• use the real tarball for public facade and MCP package-surface validation
• preserve existing package allowlists and retired-adapter rejection

Verification

• tarball discovery tests: 9/9 passed
• public facade pack/install smoke: exit 0
• MCP pack/install/handshake smoke: exit 0, 22 tools
• root workflow pack helper: exit 0
• git diff --check: exit 0

Release blocker

Trusted release run 31671943680 stopped before pack/publish because npm created the tarball but returned no JSON filename. No 0.5.0 package or release was published.

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7a41d2d0-b822-4dcf-854a-0adf41105cb2

📥 Commits

Reviewing files that changed from the base of the PR and between aea4a6f and b76bfb0.

📒 Files selected for processing (5)

• packages/mcp/scripts/smoke-package.mjs
• scripts/pack-root-release.mjs
• scripts/public-facade-smoke.mjs
• scripts/root-release-guard.mjs
• scripts/tests/root-release-guard.test.mjs

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