feat: workout-suggester, weather-aware workouts from a local Gemma

Go + Templ + HTMX app that checks the weather (Open-Meteo, MET Norway
fallback), scores run/ride/walk with plain rules, and has a local
open-weight model (Gemma 4 E2B via any OpenAI-compatible server) write
the plan. Routes are loops from your door (BRouter) plus signposted
OpenStreetMap routes (Overpass), with GPX export.

Makefile

@@ -0,0 +1,25 @@
+VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo dev)
+LDFLAGS := -s -w -X main.version=$(VERSION)
+PLATFORMS := linux/amd64 linux/arm64 darwin/arm64 darwin/amd64 windows/amd64 windows/arm64
+
+.PHONY: generate build run test dist
+
+generate:            ## regenerate Templ components
+	go tool templ generate
+
+build: generate      ## build ./bin/workout-suggester for this machine
+	go build -trimpath -ldflags "$(LDFLAGS)" -o bin/workout-suggester ./cmd/workout-suggester
+
+run: build           ## run in the foreground (reads ./.env)
+	./bin/workout-suggester --debug
+
+test:                ## unit + handler tests (no model or network needed)
+	go test -race ./...
+
+dist: generate       ## cross-compile for every platform into ./dist
+	@for p in $(PLATFORMS); do \
+		os=$${p%/*}; arch=$${p#*/}; ext=$$( [ $$os = windows ] && echo .exe ); \
+		echo "  $$os/$$arch"; \
+		CGO_ENABLED=0 GOOS=$$os GOARCH=$$arch go build -trimpath -ldflags "$(LDFLAGS)" \
+			-o dist/workout-suggester-$$os-$$arch$$ext ./cmd/workout-suggester || exit 1; \
+	done