fix(agent99): terminate remote stdin with sentinel

scripts/reboot-recovery/deploy-agent99-via-windows99-ssh.sh

@@ -11,6 +11,7 @@ readonly GITEA_ORIGIN_SSH_INTERNAL="ssh://git@192.168.0.110:2222/wooo/awoooi.git
 readonly RECEIVER_RELATIVE="scripts/reboot-recovery/agent99-remote-atomic-deploy-receiver.ps1"
 readonly PREFLIGHT_RELATIVE="scripts/reboot-recovery/agent99-live-preflight.ps1"
 readonly WRAPPER_RELATIVE="scripts/reboot-recovery/deploy-agent99-via-windows99-ssh.sh"
+readonly REMOTE_STDIN_SENTINEL="__AWOOOI_AGENT99_REMOTE_BOOTSTRAP_END_V1__"
 
 RUNTIME_FILES=(
   "agent99-bootstrap.ps1"
@@ -303,7 +304,8 @@ PY
 
 python3 - \
   "${BOOTSTRAP_PATH}" \
-  "${BOOTSTRAP_PAYLOAD_PATH}" <<'PY'
+  "${BOOTSTRAP_PAYLOAD_PATH}" \
+  "${REMOTE_STDIN_SENTINEL}" <<'PY'
 from __future__ import annotations
 
 import base64
@@ -312,13 +314,14 @@ import sys
 from pathlib import Path
 
 bootstrap_path, output_path = map(Path, sys.argv[1:3])
+sentinel = sys.argv[3]
 compressed = gzip.compress(
     bootstrap_path.read_bytes(),
     compresslevel=9,
     mtime=0,
 )
 output_path.write_text(
-    base64.b64encode(compressed).decode("ascii"),
+    base64.b64encode(compressed).decode("ascii") + "\n" + sentinel + "\n",
     encoding="ascii",
 )
 PY
@@ -349,7 +352,27 @@ from __future__ import annotations
 
 import base64
 
-decoder = r'''$payload = [Console]::In.ReadToEnd()
+decoder = r'''$sentinel = "__AWOOOI_AGENT99_REMOTE_BOOTSTRAP_END_V1__"
+$lines = New-Object System.Collections.Generic.List[string]
+$lineCount = 0
+$charCount = 0
+$terminated = $false
+while (($line = [Console]::In.ReadLine()) -ne $null) {
+  if ($line -ceq $sentinel) {
+    $terminated = $true
+    break
+  }
+  $lineCount += 1
+  $charCount += $line.Length + 2
+  if ($lineCount -gt 8 -or $charCount -gt 1048576) {
+    throw "remote_bootstrap_input_limit_exceeded"
+  }
+  [void]$lines.Add($line)
+}
+if (-not $terminated) {
+  throw "remote_bootstrap_sentinel_missing"
+}
+$payload = [string]::Join("", $lines)
 $compressed = [Convert]::FromBase64String(($payload -replace '\s', ''))
 $inputStream = New-Object IO.MemoryStream(,$compressed)
 $gzip = New-Object IO.Compression.GzipStream($inputStream, [IO.Compression.CompressionMode]::Decompress)

scripts/reboot-recovery/tests/test_agent99_remote_atomic_deploy_transport_contract.py

@@ -148,7 +148,14 @@ def test_sender_builds_sha256_envelope_and_streams_it_without_remote_cli_data()
     assert "IO.Compression.GzipStream" in source
     assert 'decoder.encode("utf-16le")' in source
     assert "-EncodedCommand" in source
-    assert "[Console]::In.ReadToEnd()" in source
+    assert "[Console]::In.ReadToEnd()" not in source
+    assert "$reader.ReadToEnd()" in source
+    assert "__AWOOOI_AGENT99_REMOTE_BOOTSTRAP_END_V1__" in source
+    assert "[Console]::In.ReadLine()" in source
+    assert "remote_bootstrap_input_limit_exceeded" in source
+    assert "remote_bootstrap_sentinel_missing" in source
+    assert "$lineCount -gt 8" in source
+    assert "$charCount -gt 1048576" in source
     assert '<"${BOOTSTRAP_PAYLOAD_PATH}"' in source
     assert "rawEnvelope" not in source
     assert "sshpass" not in source