Initial MVP implementation of Claudia Docs CLI

- Auth commands: login, logout, status
- Document commands: create, list, get, update, delete
- Project commands: list, get
- Folder commands: list, create
- Tag commands: list, create, add
- Search command
- Reasoning save command
- JSON output format with --output text option
- Viper-based configuration management
- Cobra CLI framework

internal/output/output.go

@@ -0,0 +1,82 @@
+package output
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/claudia/docs-cli/pkg/types"
+)
+
+// Formatter handles output formatting
+type Formatter struct {
+	Command string
+	Server  string
+}
+
+// NewFormatter creates a new formatter
+func NewFormatter(command, server string) *Formatter {
+	return &Formatter{
+		Command: command,
+		Server:  server,
+	}
+}
+
+// Success returns a success response
+func (f *Formatter) Success(data interface{}, durationMs int64) types.Response {
+	return types.Response{
+		Success: true,
+		Data:    data,
+		Meta: types.MetaInfo{
+			Command:    f.Command,
+			DurationMs: durationMs,
+			Server:     f.Server,
+		},
+	}
+}
+
+// Error returns an error response
+func (f *Formatter) Error(code, message string, durationMs int64) types.Response {
+	return types.Response{
+		Success: false,
+		Error: &types.ErrorInfo{
+			Code:    code,
+			Message: message,
+		},
+		Meta: types.MetaInfo{
+			Command:    f.Command,
+			DurationMs: durationMs,
+			Server:     f.Server,
+		},
+	}
+}
+
+// PrintJSON prints the response as JSON
+func PrintJSON(resp types.Response) {
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "  ")
+	_ = enc.Encode(resp)
+}
+
+// PrintJSONCompact prints the response as compact JSON
+func PrintJSONCompact(resp types.Response) {
+	enc := json.NewEncoder(os.Stdout)
+	_ = enc.Encode(resp)
+}
+
+// PrintText prints a human-readable message
+func PrintText(message string) {
+	fmt.Println(message)
+}
+
+// PrintError prints a human-readable error
+func PrintError(message string) {
+	fmt.Fprintf(os.Stderr, "Error: %s\n", message)
+}
+
+// MeasureDuration returns a function to measure duration
+func MeasureDuration() (int64, func()) {
+	return int64(0), func() {
+		// Duration is calculated where needed
+	}
+}