Cap WSB job history request at 100

Get-WBJob -Previous only accepts 1-100, so asking for 200 failed
collector setup on every run ("The 200 argument is greater than the
maximum allowed range of 100"). 100 still covers a 30-day backfill at
up to 3 backups a day. The mock now enforces the same range.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

collectors/wsb/Send-WsbBackupStatus.ps1

@@ -44,8 +44,9 @@ $DataDir = Split-Path -Parent $ConfigPath
 $LogPath = Join-Path $DataDir 'wsb-collector.log'
 $StatePath = Join-Path $DataDir 'wsb-collector.state.json'
 $MaxLogBytes = 5MB
-# Covers 30 days at several backups a day
-$MaxPreviousJobs = 200
+# Get-WBJob -Previous accepts at most 100. That covers a 30-day backfill at up to 3 backups a day;
+# servers backing up more often only get their latest 100 runs backfilled.
+$MaxPreviousJobs = 100
 $Invariant = [Globalization.CultureInfo]::InvariantCulture
 
 # ---------- Helpers ----------