Add Go implementation (goprecords)v0.1.0

- cmd/goprecords: CLI with import, query, report-from-files, test
- internal/goprecords: types, order, aggregate, db, report
- internal/version: version constant (0.1.0)
- SQLite import (repeatable: clears record table then inserts)
- Magefile: Build, Test, Install, Uninstall
- Table-driven unit tests; comparison script vs Raku guprecords
- .gitignore: *.db, /goprecords binary

Co-authored-by: Cursor <cursoragent@cursor.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/Magefile.go b/Magefile.go
new file mode 100644
index 0000000..07bfe1c
--- /dev/null
+++ b/Magefile.go
@@ -0,0 +1,65 @@
+//go:build mage
+
+package main
+
+// Magefile for goprecords. Targets follow the same style as other Go projects (e.g. hexai).
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/magefile/mage/mg"
+	"github.com/magefile/mage/sh"
+)
+
+const binaryName = "goprecords"
+
+// Default builds the binary.
+func Default() { mg.Deps(Build) }
+
+// Build builds the goprecords binary.
+func Build() error {
+	return sh.RunV("go", "build", "-o", binaryName, "./cmd/goprecords")
+}
+
+// Test runs all tests.
+func Test() error {
+	return sh.RunV("go", "test", "./...")
+}
+
+// Install builds and installs the binary to GOPATH/bin.
+func Install() error {
+	mg.Deps(Build)
+	gopath := os.Getenv("GOPATH")
+	if gopath == "" {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return fmt.Errorf("GOPATH unset and home: %w", err)
+		}
+		gopath = filepath.Join(home, "go")
+	}
+	binDir := filepath.Join(gopath, "bin")
+	if err := os.MkdirAll(binDir, 0755); err != nil {
+		return fmt.Errorf("mkdir %s: %w", binDir, err)
+	}
+	dest := filepath.Join(binDir, binaryName)
+	return sh.RunV("cp", "-v", binaryName, dest)
+}
+
+// Uninstall removes the binary from GOPATH/bin.
+func Uninstall() error {
+	gopath := os.Getenv("GOPATH")
+	if gopath == "" {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return fmt.Errorf("GOPATH unset and home: %w", err)
+		}
+		gopath = filepath.Join(home, "go")
+	}
+	dest := filepath.Join(gopath, "bin", binaryName)
+	if err := os.Remove(dest); err != nil && !os.IsNotExist(err) {
+		return err
+	}
+	return nil
+}