phase 0: project bootstrap

P0-01 Go module + cmd/server + cmd/agent skeletons + internal/ tree
P0-02 LICENSE (PolyForm NC 1.0.0), README, CONTRIBUTING
P0-03 golangci-lint, pre-commit, .editorconfig, .gitignore
P0-04 Gitea Actions CI: test (race+coverage), lint, cross-platform build matrix
P0-05 Dockerfile.server (multi-stage, distroless/static), docker-compose.yml
P0-06 Makefile with build/test/lint/fmt/run/release targets

build, vet, test, and cross-compile to linux/{amd64,arm64} + windows/amd64
all verified locally.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cmd/agent/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log/slog"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+var version = "dev"
+
+func main() {
+	showVersion := flag.Bool("version", false, "print version and exit")
+	flag.Parse()
+
+	if *showVersion {
+		fmt.Println("restic-manager-agent", version)
+		return
+	}
+
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelInfo}))
+	slog.SetDefault(logger)
+
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	slog.Info("restic-manager agent starting", "version", version)
+	<-ctx.Done()
+	slog.Info("shutting down")
+}