fix: give the Windows scheduled task the same FAILED-push backstop

The task now runs scheduling\run-sync.ps1 instead of an inline cmd.exe
loop: every provider is attempted, a run that dies without the app's
own report pushes a high-priority FAILED with the exception class only,
and each run's output is appended to cache\logs\scheduled-sync.log
because Task Scheduler keeps none. Verified under PowerShell 7.6 on
Linux with a stand-in cmd.exe; not yet run under Windows PowerShell 5.1
or Task Scheduler.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019rwKTmug58sEsJ72AuWsEi

scheduling/Register-AiChatSyncTask.ps1

@@ -35,6 +35,7 @@ $ErrorActionPreference = 'Stop'
 
 $repo = Split-Path -Parent $PSScriptRoot
 $launcher = Join-Path $repo 'ai-chat-exporter.cmd'
+$wrapper = Join-Path $PSScriptRoot 'run-sync.ps1'
 
 if ($Unregister) {
     Unregister-ScheduledTask -TaskName $TaskName -Confirm:$false -ErrorAction SilentlyContinue
@@ -42,22 +43,22 @@ if ($Unregister) {
     return
 }
 
-if (-not (Test-Path $launcher)) {
-    throw "Launcher not found at $launcher"
+foreach ($f in $launcher, $wrapper) {
+    if (-not (Test-Path $f)) { throw "Not found: $f" }
 }
 
-# A single action looping over the providers, rather than one action each.
-# Task Scheduler runs multiple actions in order but reports only the last one's
-# result, so a failure in an earlier provider would be invisible. The loop keeps
-# going after a failure and propagates a non-zero exit code.
+# One action running run-sync.ps1, rather than one action per provider: Task
+# Scheduler runs multiple actions in order but reports only the last one's
+# result, so a failure in an earlier provider would be invisible. The script
+# keeps going after a failure, exits non-zero if any provider failed, and pushes
+# a FAILED notification for any run that died without sending its own.
 #
-# /v:on and !RC! are required, not stylistic: cmd expands every %VAR% on a
-# command line *before* running any of it, so "exit /b %RC%" would report the
-# value RC had before the loop ever ran - i.e. always success. Delayed expansion
-# reads it at the point of use.
-$loop = ($Provider | ForEach-Object { "`"$launcher`" sync --provider $_ --joplin-optional || set RC=1" }) -join ' & '
-$taskArgs = "/v:on /c set RC=0 & $loop & exit /b !RC!"
-$actions = New-ScheduledTaskAction -Execute 'cmd.exe' `
+# Providers go as separate arguments: under -File, "chatgpt,claude" would arrive
+# as one string. -WindowStyle Hidden because the output now goes to
+# cache\logs\scheduled-sync.log, so the console window would only ever be blank.
+$taskArgs = "-NoProfile -NonInteractive -ExecutionPolicy Bypass -WindowStyle Hidden " +
+    "-File `"$wrapper`" $($Provider -join ' ')"
+$actions = New-ScheduledTaskAction -Execute 'powershell.exe' `
     -Argument $taskArgs `
     -WorkingDirectory $repo
 
@@ -82,12 +83,12 @@ Register-ScheduledTask -TaskName $TaskName `
 Write-Host "Registered '$TaskName' - daily at $Time for: $($Provider -join ', ')"
 Write-Host ''
 Write-Host 'Command the task will run:'
-Write-Host "  cmd.exe $taskArgs"
+Write-Host "  powershell.exe $taskArgs"
 Write-Host "  (working directory: $repo)"
 Write-Host ''
 Write-Host 'Next steps:'
 Write-Host "  * Run it once now:      Start-ScheduledTask -TaskName $TaskName"
 Write-Host "  * Check the result:     Get-ScheduledTaskInfo -TaskName $TaskName"
-Write-Host "  * Read the log:         Get-Content '$repo\cache\logs\exporter.log' -Tail 50"
+Write-Host "  * Read the run output:  Get-Content '$repo\cache\logs\scheduled-sync.log' -Tail 50"
 Write-Host '  * The terms-of-service notice must have been acknowledged'
 Write-Host '    interactively once on this machine, or the task exits 1.'