runtime bump v 0.1.28

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v0.1.28 is a stability-focused runtime upgrade for HTML vibes. We tightened the contract between compilation and playback so published HTML runs from a normalized bundle with explicit runtime metadata instead of depending on brittle browser-time behavior. The runtime now handles import maps and module preloads more deliberately, resolves relative assets against the actual artifact bundle, and surfaces execution-plan drift as structured runtime failures instead of opaque breakage. The result is a runtime that is stricter than older versions, but much more predictable across Studio previews, published vibes, and VXBE runtime hosts.