Fix search human-mode output to match engine API response

The Go client struct expected a nested document object and top-level
page/section fields, but the engine returns flat results with metadata
in chunk_metadata. This caused empty display for title, type, tags,
page, and section in human output mode.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client/cmd/search.go

@@ -67,15 +67,12 @@ func runSearch(cmd *cobra.Command, args []string) error {
 
 	var result struct {
 		Results []struct {
-			Score    float64 `json:"score"`
-			Document struct {
-				Title string `json:"title"`
-				Type  string `json:"doc_type"`
-				Tags  []string `json:"tags"`
-			} `json:"document"`
-			Page    interface{} `json:"page"`
-			Section string      `json:"section"`
-			Text    string      `json:"text"`
+			Score         float64                `json:"score"`
+			Title         string                 `json:"title"`
+			DocType       string                 `json:"doc_type"`
+			Tags          []string               `json:"tags"`
+			ChunkMetadata map[string]interface{} `json:"chunk_metadata"`
+			Text          string                 `json:"text"`
 		} `json:"results"`
 	}
 
@@ -103,26 +100,28 @@ func runSearch(cmd *cobra.Command, args []string) error {
 			snippet = snippet[:200] + "..."
 		}
 
-		fmt.Printf("\n%d. [%.4f] %s\n", i+1, r.Score, r.Document.Title)
+		fmt.Printf("\n%d. [%.4f] %s\n", i+1, r.Score, r.Title)
 
 		location := ""
-		if r.Page != nil {
-			location = fmt.Sprintf("Page %v", r.Page)
+		if page, ok := r.ChunkMetadata["page"]; ok && page != nil {
+			location = fmt.Sprintf("Page %v", page)
 		}
-		if r.Section != "" {
-			if location != "" {
-				location += " / "
+		if section, ok := r.ChunkMetadata["section_header"]; ok && section != nil {
+			if s, ok := section.(string); ok && s != "" {
+				if location != "" {
+					location += " / "
+				}
+				location += s
 			}
-			location += r.Section
 		}
 		if location != "" {
 			fmt.Printf("   Location: %s\n", location)
 		}
-		if r.Document.Type != "" {
-			fmt.Printf("   Type: %s\n", r.Document.Type)
+		if r.DocType != "" {
+			fmt.Printf("   Type: %s\n", r.DocType)
 		}
-		if len(r.Document.Tags) > 0 {
-			fmt.Printf("   Tags: %s\n", joinStrings(r.Document.Tags))
+		if len(r.Tags) > 0 {
+			fmt.Printf("   Tags: %s\n", joinStrings(r.Tags))
 		}
 		fmt.Printf("   %s\n", snippet)
 	}