fix(mq): skip closed MRs in list, next, and ready views (#563)

* fix(mq): skip closed MRs in list, next, and ready views (gt-qtb3w)

The gt mq list command with --status=open filter was incorrectly displaying
CLOSED merge requests as 'ready'. This occurred because bd list --status=open
was returning closed issues.

Added manual status filtering in three locations:
- mq_list.go: Filter closed MRs in all list views
- mq_next.go: Skip closed MRs when finding next ready MR
- engineer.go: Skip closed MRs in refinery's ready queue

Also fixed build error in mail_queue.go where QueueConfig struct (non-pointer)
was being compared to nil.

Workaround for upstream bd list status filter bug.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* style: fix gofmt issue in engineer.go comment block

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

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

internal/cmd/mq_list.go

@@ -71,6 +71,22 @@ func runMQList(cmd *cobra.Command, args []string) error {
 	var scored []scoredIssue
 
 	for _, issue := range issues {
+		// Manual status filtering as workaround for bd list not respecting --status filter
+		if mqListReady {
+			// Ready view should only show open MRs
+			if issue.Status != "open" {
+				continue
+			}
+		} else if mqListStatus != "" && !strings.EqualFold(mqListStatus, "all") {
+			// Explicit status filter should match exactly
+			if !strings.EqualFold(issue.Status, mqListStatus) {
+				continue
+			}
+		} else if mqListStatus == "" && issue.Status != "open" {
+			// Default case (no status specified) should only show open
+			continue
+		}
+
 		// Parse MR fields
 		fields := beads.ParseMRFields(issue)
 

internal/cmd/mq_next.go

@@ -73,6 +73,10 @@ func runMQNext(cmd *cobra.Command, args []string) error {
 	// Filter to only ready MRs (no blockers)
 	var ready []*beads.Issue
 	for _, issue := range issues {
+		// Skip closed MRs (workaround for bd list not respecting --status filter)
+		if issue.Status != "open" {
+			continue
+		}
 		if len(issue.BlockedBy) == 0 && issue.BlockedByCount == 0 {
 			ready = append(ready, issue)
 		}