feat(logging): enhance logging for metadata extraction and MCP tool handling

internal/ai/compat/client.go

@@ -208,6 +208,33 @@ func (c *Client) ExtractMetadata(ctx context.Context, input string) (thoughttype
 		return thoughttypes.ThoughtMetadata{}, fmt.Errorf("%s extract metadata: input must not be empty", c.name)
 	}
 
+	start := time.Now()
+	if c.log != nil {
+		c.log.Info("metadata client started",
+			slog.String("provider", c.name),
+			slog.String("model", c.metadataModel),
+		)
+	}
+
+	logCompletion := func(model string, err error) {
+		if c.log == nil {
+			return
+		}
+
+		attrs := []any{
+			slog.String("provider", c.name),
+			slog.String("model", model),
+			slog.Duration("duration", time.Since(start)),
+		}
+		if err != nil {
+			attrs = append(attrs, slog.String("error", err.Error()))
+			c.log.Error("metadata client completed", attrs...)
+			return
+		}
+
+		c.log.Info("metadata client completed", attrs...)
+	}
+
 	result, err := c.extractMetadataWithModel(ctx, input, c.metadataModel)
 	if errors.Is(err, errMetadataEmptyResponse) {
 		c.noteEmptyResponse(c.metadataModel)
@@ -217,6 +244,7 @@ func (c *Client) ExtractMetadata(ctx context.Context, input string) (thoughttype
 	}
 	if err == nil {
 		c.noteModelSuccess(c.metadataModel)
+		logCompletion(c.metadataModel, nil)
 		return result, nil
 	}
 
@@ -247,13 +275,16 @@ func (c *Client) ExtractMetadata(ctx context.Context, input string) (thoughttype
 		}
 		if fallbackErr == nil {
 			c.noteModelSuccess(fallbackModel)
+			logCompletion(fallbackModel, nil)
 			return fallbackResult, nil
 		}
 		err = fallbackErr
 	}
 
 	if ctx.Err() != nil {
-		return thoughttypes.ThoughtMetadata{}, fmt.Errorf("%s metadata: %w", c.name, ctx.Err())
+		err = fmt.Errorf("%s metadata: %w", c.name, ctx.Err())
+		logCompletion(c.metadataModel, err)
+		return thoughttypes.ThoughtMetadata{}, err
 	}
 
 	heuristic := heuristicMetadataFromInput(input)
@@ -263,6 +294,7 @@ func (c *Client) ExtractMetadata(ctx context.Context, input string) (thoughttype
 			slog.String("error", err.Error()),
 		)
 	}
+	logCompletion(c.metadataModel, nil)
 	return heuristic, nil
 }