fix(list): populate dependencies field in JSON output (bd-tjxh) (#1296)

Previously, `bd list --json` only included dependency_count and
dependent_count but not the actual dependency records. This broke
callers like `gt hook --json` that need to know what each issue
depends on to determine ready steps.

Now populates issue.Dependencies using GetAllDependencyRecords,
matching the behavior of `bd show --json`.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/list.go

@@ -1189,10 +1189,12 @@ var listCmd = &cobra.Command{
 			}
 			labelsMap, _ := store.GetLabelsForIssues(ctx, issueIDs)
 			depCounts, _ := store.GetDependencyCounts(ctx, issueIDs)
+			allDeps, _ := store.GetAllDependencyRecords(ctx)
 
-			// Populate labels for JSON output
+			// Populate labels and dependencies for JSON output
 			for _, issue := range issues {
 				issue.Labels = labelsMap[issue.ID]
+				issue.Dependencies = allDeps[issue.ID]
 			}
 
 			// Build response with counts