feat: send text to named sessions with draft protection and listener isolation

- chat send and listener-smoke accept --session; defaults remain File Transfer Assistant.
- Reject existing drafts, reacquire the send control after input changes, and require a
  fresh message fingerprint for confirmation without retrying failed sends.
- Test-NamedTextSend sends the same text twice and verifies distinct confirmed fingerprints;
  Test-NamedListeners -SendMarkers verifies per-window own events exactly once with zero
  cross-session events. Note export now requires a unique fresh owned note window and keeps
  repeated paragraphs. 97 Core tests pass; real-machine validated.

scripts/windows/Test-NamedListeners.ps1

@@ -1,6 +1,7 @@
 param(
     [Parameter(Mandatory=$true)][string]$Executable,
-    [Parameter(Mandatory=$true)][string]$OutputDirectory
+    [Parameter(Mandatory=$true)][string]$OutputDirectory,
+    [switch]$SendMarkers
 )
 $ErrorActionPreference='Stop'
 $exe=(Resolve-Path $Executable).Path
@@ -9,29 +10,56 @@ if (Test-Path $directory) { throw 'Use a new evidence directory.' }
 [IO.Directory]::CreateDirectory($directory) | Out-Null
 $targets=@('文件传输助手','消息测试专用群组')
 $processes=@()
+$sent=@()
+$seconds=if($SendMarkers){45}else{8}
 try {
     for($i=0;$i -lt $targets.Count;$i++) {
         $arguments=@('chat','monitor','--independent','--session',('"'+$targets[$i]+'"'),
-            '--seconds','8','--state-file',('"'+$directory+'\state-'+$i+'.json"'),'--timeout','20')
+            '--seconds',$seconds,'--state-file',('"'+$directory+'\state-'+$i+'.json"'),'--timeout','60')
         $process=Start-Process $exe -ArgumentList $arguments -PassThru -NoNewWindow `
             -RedirectStandardOutput "$directory\events-$i.jsonl" -RedirectStandardError "$directory\stderr-$i.txt"
         $null=$process.Handle # Retain the process handle so PowerShell 5 can retrieve ExitCode after exit.
         $processes+=$process
     }
+    if($SendMarkers){
+        $readyDeadline=[DateTime]::UtcNow.AddSeconds(20)
+        while(!(Test-Path "$directory\state-0.json") -or !(Test-Path "$directory\state-1.json")){
+            if([DateTime]::UtcNow -ge $readyDeadline){throw 'Listeners did not establish both baselines; no messages sent.'}
+            Start-Sleep -Milliseconds 200
+        }
+        foreach($target in $targets){
+            $marker='wx-agent-isolation-'+[Guid]::NewGuid().ToString('N')
+            $message=(& $exe chat send --session $target --text $marker --timeout 30 | Out-String) | ConvertFrom-Json
+            $code=$LASTEXITCODE
+            $sent+=@{ExitCode=$code;Fingerprint=$message.Fingerprint}
+            if($code -ne 0){break} # Never retry a failed send.
+        }
+    }
     $checks=@()
     for($i=0;$i -lt $processes.Count;$i++) {
         $process=$processes[$i]
-        if (!$process.WaitForExit(30000)) { throw 'Named listener exceeded its deadline.' }
+        if (!$process.WaitForExit(60000)) { throw 'Named listener exceeded its deadline.' }
         $exitCode=$process.ExitCode
         $statePath="$directory\state-$i.json"
         $state=if(Test-Path $statePath){ Get-Content $statePath -Raw | ConvertFrom-Json }else{$null}
         & $exe inspect-ui --window-title $targets[$i] --output "$directory\ui-$i.json" --timeout 20 | Out-Null
         $inspectCode=$LASTEXITCODE
-        $checks+=@{Index=$i;ExitCode=$exitCode;CheckpointSaved=($null -ne $state);
+        $check=@{Index=$i;ExitCode=$exitCode;CheckpointSaved=($null -ne $state);
             SessionMatches=($state.session -eq $targets[$i]);FingerprintCount=if($null -ne $state){@($state.fingerprints).Count}else{0};InspectExit=$inspectCode}
+        if($SendMarkers -and $sent.Count -eq 2){
+            $events=@(Get-Content "$directory\events-$i.jsonl" | Where-Object {$_} | ForEach-Object {$_ | ConvertFrom-Json})
+            $check.OwnEvents=@($events | Where-Object {$_.message.Fingerprint -eq $sent[$i].Fingerprint -and $_.Session -ceq $targets[$i]}).Count
+            $check.OtherSessionEvents=@($events | Where-Object {$_.message.Fingerprint -eq $sent[1-$i].Fingerprint}).Count
+        }
+        $checks+=$check
     }
     $passed=@($checks | Where-Object {$_.ExitCode -ne 0 -or !$_.CheckpointSaved -or !$_.SessionMatches -or $_.FingerprintCount -lt 1 -or $_.InspectExit -ne 0}).Count -eq 0
-    $result=@{Checks=$checks;Passed=$passed;MessagesSent=0;Scope='Parallel named-window baseline only; not incoming-message delivery or endurance.'}
+    if($SendMarkers){
+        $passed=$passed -and $sent.Count -eq 2 -and @($sent | Where-Object {$_.ExitCode -ne 0}).Count -eq 0 -and
+            @($checks | Where-Object {$_.OwnEvents -ne 1 -or $_.OtherSessionEvents -ne 0}).Count -eq 0
+    }
+    $result=@{Checks=$checks;Passed=$passed;AttemptedSends=$sent.Count;MessagesSent=@($sent | Where-Object {$_.ExitCode -eq 0}).Count;
+        Scope=if($SendMarkers){'Own sent-message events across two independent windows; not peer incoming delivery or endurance.'}else{'Parallel named-window baseline only; not incoming-message delivery or endurance.'}}
     [IO.File]::WriteAllText("$directory\summary.json",($result | ConvertTo-Json -Depth 5),(New-Object Text.UTF8Encoding($false)))
     if(!$passed){exit 2}
 } finally {

scripts/windows/Test-NamedTextSend.ps1

@@ -0,0 +1,23 @@
+param(
+    [Parameter(Mandatory=$true)][string]$Executable,
+    [Parameter(Mandatory=$true)][string]$OutputDirectory,
+    [string]$Session='消息测试专用群组'
+)
+$ErrorActionPreference='Stop'
+$exe=(Resolve-Path $Executable).Path
+if(Test-Path $OutputDirectory){throw 'Use a fresh evidence directory.'}
+$directory=(New-Item -ItemType Directory $OutputDirectory).FullName
+$marker='wx-agent-repeat-'+[Guid]::NewGuid().ToString('N')
+$results=@()
+for($i=0;$i -lt 2;$i++){
+    $result=(& $exe chat send --session $Session --text $marker --timeout 30 | Out-String) | ConvertFrom-Json
+    $exitCode=$LASTEXITCODE
+    $results+=@{ExitCode=$exitCode;Fingerprint=$result.Fingerprint;Error=$result.error;Message=$result.message}
+    if($exitCode -ne 0){break} # Never retry a failed send.
+}
+$success=($results.Count -eq 2 -and $results[0].ExitCode -eq 0 -and $results[1].ExitCode -eq 0 -and
+    $null -ne $results[0].Fingerprint -and $null -ne $results[1].Fingerprint -and
+    $results[0].Fingerprint -ne $results[1].Fingerprint)
+@{Success=$success;Results=$results;AttemptedSends=$results.Count;BinarySha256=(Get-FileHash $exe -Algorithm SHA256).Hash} |
+    ConvertTo-Json -Depth 5 | Set-Content "$directory\summary.json" -Encoding UTF8
+if(!$success){exit 1}