AGENTS.md

Repo root is a single Go module (go.mod), with the app entrypoint in main.go and tests in main_test.go.
Static UI files live in static/ and are embedded with //go:embed static/*; changing HTML or SVG requires rebuilding/rerunning tests, not a separate asset pipeline.
The server will not start unless WRITE_SECRET is set, or supplied via a local config.json if present.
config.json is gitignored; treat it as a local-only runtime override, not a committed config file.
ADDR defaults to :8080 when unset.
chart_max_watts comes from config.json and only affects the chart when it is greater than zero.
The only supported write endpoint is POST /write with X-Secret; requests can be JSON ({"watts":123}) or form-encoded (watts=123).
History is kept in memory only, trimmed to the last 12 hours and capped at 10000 points.
Use go test ./... from the repo root for verification; targeted tests use go test -run TestName.