fix(completion): accept instance-qualified hosts for a bare name in zsh

With several NetBox instances, netssh offers "prod/fsn1-bx1…" for the
typed text "fsn1". compadd discarded these matches because they do not
start with the typed word, so <Tab> found nothing. The matcher
'l:|=*' lets zsh accept text before the typed word; netssh has already
filtered the candidates.

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

internal/hook/completion_test.go

@@ -200,7 +200,7 @@ _netssh
 		t.Fatalf("%v\n%s", err, out)
 	}
 	// Directive 36 = NoFileComp|KeepOrder: unsorted host group, no file fallback.
-	want := "describe cache:Manage the cache\ncompadd -V hosts -X %Bhosts%b -- web01 web:02\n"
+	want := "describe cache:Manage the cache\ncompadd -V hosts -X %Bhosts%b -M l:|=* -- web01 web:02\n"
 	if string(out) != want {
 		t.Fatalf("got:\n%s\nwant:\n%s", out, want)
 	}

internal/hook/zsh.go

@@ -58,12 +58,13 @@ _netssh() {
     _describe -t commands 'netssh command' items $nospace && ret=0
   fi
   if (( $#plain )); then
+    # netssh already filtered the hosts, also by the name after an instance
+    # prefix: "fsn1" offers "prod/fsn1-…". 'l:|=*' lets zsh accept text
+    # before the typed word instead of discarding these matches.
+    local -a group=(-J hosts)
     # Directive 32: keep the order supplied by netssh.
-    if (( directive & 32 )); then
-      compadd -V hosts -X '%Bhosts%b' $nospace -- $plain && ret=0
-    else
-      compadd -J hosts -X '%Bhosts%b' $nospace -- $plain && ret=0
-    fi
+    (( directive & 32 )) && group=(-V hosts)
+    compadd $group -X '%Bhosts%b' -M 'l:|=*' $nospace -- $plain && ret=0
   fi
   # Directive 4: no file completion as a fallback.
   if (( ! $#lines && ! (directive & 4) )); then