Add pi support

internal/adapters/pi/import.go

@@ -0,0 +1,21 @@
+package pi
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+)
+
+func importFrom(home string) (*adapter.ImportResult, error) {
+	base := filepath.Join(home, ".pi", "agent")
+	res := &adapter.ImportResult{}
+
+	if body, err := os.ReadFile(filepath.Join(base, "AGENTS.md")); err == nil {
+		res.Instructions = string(body)
+	} else if !os.IsNotExist(err) {
+		return nil, err
+	}
+
+	return res, nil
+}