v2.2.15

• Merge pull request #302 from ObjectiveAI/2-2-15-2
• chore(release): 2.2.15
• fix(scaffold): leave node's path external — the viewer half did not build
• fix(viewer): build the plugins tab — declared, but never emitted
• fix(viewer): preserve entry signatures — release builds exported nothing
• fix(laboratory): the host actually exits on Shutdown — kill never hangs
• chore(scaffold)!: ship no Cargo.lock — the author commits their own