feat(logging): order log fields for improved readability

internal/logging/global_logger.go

@@ -6,7 +6,6 @@ import (
 	"io"
 	"os"
 	"path/filepath"
-	"sort"
 	"strings"
 	"sync"
 
@@ -30,6 +29,9 @@ var (
 // Format: [2025-12-23 20:14:04] [debug] [manager.go:524] | a1b2c3d4 | Use API key sk-9...0RHO for model gpt-5.2
 type LogFormatter struct{}
 
+// logFieldOrder defines the display order for common log fields.
+var logFieldOrder = []string{"provider", "model", "mode", "budget", "level", "original_value", "min", "max", "clamped_to", "error"}
+
 // Format renders a single log entry with custom formatting.
 func (m *LogFormatter) Format(entry *log.Entry) ([]byte, error) {
 	var buffer *bytes.Buffer
@@ -56,17 +58,19 @@ func (m *LogFormatter) Format(entry *log.Entry) ([]byte, error) {
 	// Build fields string (excluding request_id which is already shown)
 	var fieldsStr string
 	if len(entry.Data) > 0 {
-		var keys []string
-		for k := range entry.Data {
-			if k == "request_id" {
+		seen := make(map[string]bool)
+		var fields []string
+		for _, k := range logFieldOrder {
+			if v, ok := entry.Data[k]; ok {
+				fields = append(fields, fmt.Sprintf("%s=%v", k, v))
+				seen[k] = true
+			}
+		}
+		for k, v := range entry.Data {
+			if k == "request_id" || seen[k] {
 				continue
 			}
-			keys = append(keys, k)
-		}
-		sort.Strings(keys)
-		var fields []string
-		for _, k := range keys {
-			fields = append(fields, fmt.Sprintf("%s=%v", k, entry.Data[k]))
+			fields = append(fields, fmt.Sprintf("%s=%v", k, v))
 		}
 		if len(fields) > 0 {
 			fieldsStr = " " + strings.Join(fields, " ")

internal/thinking/apply.go

@@ -149,7 +149,7 @@ func ApplyThinking(body []byte, model string, provider string) ([]byte, error) {
 			"provider": provider,
 			"model":    modelInfo.ID,
 			"error":    err.Error(),
-		}).Warn("thinking: validation failed, returning original body")
+		}).Warn("thinking: validation failed")
 		// Return original body on validation failure (defensive programming).
 		// This ensures callers who ignore the error won't receive nil body.
 		// The upstream service will decide how to handle the unmodified request.

internal/thinking/validate.go

@@ -76,12 +76,10 @@ func ClampBudgetWithZeroCheck(value, min, max int, zeroAllowed bool) int {
 			return 0
 		}
 		log.WithFields(log.Fields{
-			"original_value": value,
-			"clamped_to":     min,
-			"min":            min,
-			"max":            max,
-			"reason":         "zero_not_allowed",
-		}).Warn("budget clamped: zero not allowed")
+			"clamped_to": min,
+			"min":        min,
+			"max":        max,
+		}).Warn("thinking: budget zero not allowed")
 		return min
 	}
 
@@ -253,8 +251,8 @@ func convertAutoToMidRange(config ThinkingConfig, support *registry.ThinkingSupp
 func logClamp(original, clampedTo, min, max int) {
 	log.WithFields(log.Fields{
 		"original_value": original,
-		"clamped_to":     clampedTo,
 		"min":            min,
 		"max":            max,
-	}).Debug("budget clamped: value outside model range")
+		"clamped_to":     clampedTo,
+	}).Debug("thinking: budget clamped")
 }