//go:embed needs internal/webdist/dist to exist at compile time, so a
one-line placeholder index.html is committed there and the real build
(Docker, or a manual copy of web/dist) overwrites it. One mux serves
/, /api, and a /healthz for the compose healthcheck to come.
useSimStore is the one reactive module singleton from the spec: panels
over a shared base config, runs debounced 400 ms, one POST /api/scenario
per panel in parallel, results swapped in atomically only when every
request succeeds. Failures keep the last good results; engine 400s are
routed to an inline validationError, everything else to the banner
message. Stale in-flight responses lose to newer runs per panel.
URL state follows spec section 7 (readable params, repeated panel=,
focus index, full fallback to the preset on any malformed part) and is
covered by round-trip and rejection tests. The study copy and initial
panels live in the deepfake-school preset module; formatPct is the
single percent-rounding rule.
The vitest tsconfig now keeps lib at ES2022 like the app config, and
prettier skips the tygo-generated src/types (drift guard stays green).
go.mod declares the module path (github.com/JustinZeus/spreadlab); every
import inside the repo is spelled relative to it. Layout follows the
standard Go shape: cmd/<binary>/main.go per executable, internal/ for
packages other modules may not import (the compiler enforces this).
No engine code yet, just a placeholder main that proves 'go build' works.
