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Two spikes validating the riskiest seams of the plugin-kit design before implementation: - HttpApi (effect/unstable/httpapi) served on Bun behind the SDK's servePluginUi using ONLY effect-core layers (Etag.layerWeak, Path.layer, HttpPlatform.layer + FileSystem.layerNoop) — no platform package. Auth, schema validation, and static fallthrough all verified end-to-end. - Browser client prefix strategy for the console proxy: both transformClient+prependUrl AND baseUrl preserve the /plugin-ui/<id> path prefix. Nested Schema.withDecodingDefaultKey defaults confirmed (Effect-valued defaults; encodingStrategy "omit" restores raw shape on encode). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>