design: unpark frontend architecture — vision v0.6 + ADR-016 (Frontend Live-Update Transport)#33
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…d Live-Update Transport)
Discharges the vision's explicit frontend-architecture unpark trigger ("CritterBids
lands on a stable live-update pattern"), confirmed by the sibling-repo frontend survey
(docs/research/frontend-survey-sibling-repos.md, committed in prior session).
ADR-016 (Accepted): SignalR (`@microsoft/signalr` v10) as the browser-client
live-update transport for rider, driver, and ops frontend surfaces. Architecture is
the transport-agnostic push→Query-cache-bridge pattern from CritterBids'
`createSignalRProvider<TMessage>`: component contract (useListen / useConnectionState /
applyMessage) is decoupled from transport at the createConnection seam. gRPC-web ruled
out as niche and experimental; gRPC thesis demonstrated by the backend service mesh.
Cross-references ADR-005 (browser-client push is the fourth transport category not
covered by service-to-service ADR-005) and ADR-006 (accessTokenFactory token
acquisition for authed hub connections).
Vision v0.6: adopted convergent house stack (React 19 / Vite 8 / TS 6 / Tailwind v4 /
TanStack Query / shadcn/ui / Zod) and audience-SPA monorepo shape (rider / driver /
operations / shared / e2e) as working direction in §Tentative Technology Stack. Removed
"Frontend architecture" and "Map library for frontend" from §Explicitly Parked. Added
three new §Open Questions entries: map library (candidates: MapLibre GL / Leaflet /
deck.gl; couples to Telemetry BC geospatial representation), contracts-package shape
(one @crittercab/shared vs. per-BC packages), and frontend monorepo vs. separate repos.
Two successor sessions named: map-library spike (after Telemetry geospatial repr. is
settled) and contracts/monorepo session (at first frontend implementation).
Null narrative/workshop spec delta — vision/ADR-layer design-return per ADR-004.
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Summary
createSignalRProvider<TMessage>; component contract decoupled from transport at thecreateConnectionseam. gRPC-web ruled out as niche/experimental — gRPC thesis demonstrated by the backend service mesh, not the browser transport. Cross-references ADR-005 (browser-client push is the fourth transport category) and ADR-006 (token acquisition for authed hub connections).rider/driver/operations/shared/e2e) as working direction. Removed "Frontend architecture" and "Map library for frontend" from§Explicitly Parked. Added three§Open Questionsentries: map library, contracts-package shape, frontend monorepo vs. separate repos.Artifacts changed
docs/decisions/016-frontend-live-update-transport.mddocs/decisions/README.mddocs/vision/README.mddocs/retrospectives/frontend-architecture-unpark.mddocs/retrospectives/README.mdDesign-return cadence
This is a design-return per ADR-004 — deliberate step back into the design phase after the recent implementation/tidy/workshop stretch. No code is produced; the deliverables are the vision amendment and the ADR. The survey input (
docs/research/frontend-survey-sibling-repos.md) was committed in the prior session.Out of scope