Linked zones: PTR records follow each view, deleting an override stays deleted

Auto-PTR (and --ptr) changed PTR records in every linked view, whatever
view the address record was in. ptrSync now compares each touched A/AAAA
set before and after, per view, and changes only that view's reverse
zone. PTR records in linked reverse zones are local (fill too); a shared
PTR set is made local in each view before one view changes it.

Deleting a linked zone's local records no longer brings the shared ones
back into the view: the name and type are gone from that view and the
other views keep theirs, local to each. Share still restores.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/engine/reverse.go

@@ -8,7 +8,6 @@ import (
 
 	"jarl/internal/dnsname"
 	"jarl/internal/model"
-	"jarl/internal/rr"
 	"jarl/internal/validate"
 )
 
@@ -227,9 +226,11 @@ func (x *expander) zoneFillPTR(req Request) ([]model.Op, error) {
 	}
 	var ops []model.Op
 	for i, f := range fills {
+		// Local to the view in a linked zone, like the PTR records that
+		// follow address records (ptrChange).
 		ri := RecordInput{ZoneID: z.ID, Name: model.Ptr(f.Name), Type: model.Ptr("PTR"), Data: model.Ptr(f.Target)}
 		if z.LinkGroup != 0 {
-			ri.SharedID = model.Ptr(ids[i])
+			ri.SharedID = model.Ptr(int64(0))
 		}
 		ops = append(ops, newOp(OpRecordCreate, ids[i], 0, ri, fmt.Sprintf("add %s IN PTR %s", f.Name, f.Target)))
 	}
@@ -531,16 +532,6 @@ func (x *expander) reverseDismiss(req Request, dismiss bool) ([]model.Op, error)
 
 var cgnat = netip.MustParsePrefix("100.64.0.0/10")
 
-// autoPTR reports whether a record's PTR is kept in step by its zone's
-// auto_ptr setting.
-func autoPTR(z *model.Zone, owner string, p *rr.Parsed) bool {
-	if z == nil || !z.AutoPTR || strings.HasPrefix(owner, "*.") {
-		return false
-	}
-	_, ok := addrOf(p)
-	return ok
-}
-
 func viewName(st *model.State, id int64) string {
 	if v := st.Views[id]; v != nil {
 		return v.Name