fix(automation): ASCII log prefix to avoid console encoding garble

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

automation/claude-issue-watcher.ps1

@@ -110,7 +110,7 @@ if (-not (Test-Path (Join-Path $cfg.workDir '.git'))) {
 foreach ($issue in $queued) {
     $n = $issue.number
     $branch = "$($cfg.branchPrefix)$n"
-    Log "── Working issue #${n}: $($issue.title)"
+    Log "-- Working issue #${n}: $($issue.title)"
 
     Set-IssueLabels $n -Remove @('claude-queue', 'claude-failed') -Add @('claude-working')
     Add-IssueComment $n "🤖 Claude has started working on this issue on branch ``$branch``."