Phase 6

CLAUDE.md

@@ -41,7 +41,7 @@ Two primary modes toggled via toolbar:
 ## Technology Stack
 
 - **Backend:** Go 1.22+, single binary, `//go:embed` for frontend assets
-- **Frontend:** Svelte 5 + TypeScript + Vite; plots via uPlot (time-series) and ECharts (others); edit canvas via Konva
+- **Frontend:** Preact 10 + TypeScript; bundled by esbuild Go API (no npm/Node.js); plots via uPlot (time-series) and ECharts (others); all vendor JS/CSS checked into `web/vendor/`
 - **Config:** TOML file + `UOPI_*` env var overrides (`github.com/BurntSushi/toml`)
 - **WebSocket:** `nhooyr.io/websocket` (no CGo)
 - **EPICS:** CGo bindings to `libca`; `gopher-lua` for synthetic signal Lua scripts
@@ -57,7 +57,10 @@ internal/datasource/# DataSource interface + EPICS + synthetic (Phases 2–3)
 internal/dsp/       # DSP functions for synthetic (Phase 3)
 internal/storage/   # interface XML persistence (Phase 6)
 internal/api/       # REST handlers (Phase 1+)
-web/                # Svelte source (npm); web/embed.go provides embed.FS to Go
+web/                # Preact/TSX source; web/embed.go provides embed.FS to Go
+web/src/            # TypeScript/TSX components (Preact)
+web/vendor/         # vendored JS/CSS (preact, uplot, echarts) — no npm required
+tools/buildfrontend/# esbuild Go API bundler (invoked by go generate)
 web/dist/           # built frontend — generated, not committed
 dist/               # compiled binary — generated, not committed
 ```
@@ -79,9 +82,6 @@ make frontend
 # Run backend (dev mode, frontend must be running separately)
 go run ./cmd/uopi
 
-# Frontend dev server (proxies /api and /healthz to :8080)
-cd web && npm run dev
-
 # All tests
 make test
 
@@ -90,12 +90,6 @@ go test ./internal/broker/... -run TestFanOut
 
 # Go vet
 go vet ./...
-
-# Svelte type check
-cd web && npm run check
-
-# Svelte lint
-cd web && npm run lint
 ```
 
 ## Key Architectural Notes