diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..2c225076
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+# Windows launcher scripts MUST be CRLF (rant 2026-08-12T12:30:41).
+# LF-only .cmd files are misparsed by cmd.exe: the whole file is joined into
+# one serial command stream (@echo off ignored, PATH collisions produce
+# arbitrary errors, exit code non-zero) → the installer aborts with
+# "stop-emrg.cmd exit code 1". .ps1 is PowerShell (LF-tolerant) but kept CRLF
+# for consistency. Git normalizes checkout to CRLF on every platform.
+*.cmd text eol=crlf
+*.bat text eol=crlf
+*.ps1 text eol=crlf
diff --git a/Agent.md b/Agent.md
index 254a12d2..620e8730 100644
--- a/Agent.md
+++ b/Agent.md
@@ -112,7 +112,7 @@ Community needs voiced in HN agent-UI discussions map directly to EMRG's design:
 pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.port; python -m emrg
 ```
 
-Python: `uv run pytest tests/ -v` (729) — import check: `uv run python -c "from emrg.client.app import run_client"`
+Python: `uv run pytest tests/ -v` (730) — import check: `uv run python -c "from emrg.client.app import run_client"`
 GUI: `cd emrg/gui && npm test` (221: 43 daemon_client + 19 conn-manager + 22 app-commands + 100 renderer smoke + 15 i18n + 7 integration + 3 commands + 5 build-config + 7 gui-state) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
 CI: `uv run pytest` + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)
 Re-trigger: `scripts/re-trigger-ci.sh [branch]` (workflow_dispatch, #527 — 替代空 commit 重触发：Actions outage 会整段丢弃 push 事件，dispatch 走 API 路径不受影响)
diff --git a/bin/stop-git.ps1 b/bin/stop-git.ps1
index 4b57f0ee..dee4c175 100644
--- a/bin/stop-git.ps1
+++ b/bin/stop-git.ps1
@@ -32,4 +32,11 @@ Get-CimInstance Win32_Process |
 Start-Sleep -Milliseconds 300
 
 $left = @(Get-CimInstance Win32_Process | Where-Object { $_.ExecutablePath -like $prefix })
-if ($left.Count -gt 0) { exit 1 } else { exit 0 }
+if ($left.Count -gt 0) {
+  # Truthful failure (rant 2026-08-12T12:30:41): never report success while a
+  # process still holds the prefix. Name the survivors so the installer can
+  # show a useful message instead of a silent bogus exit=0.
+  $left | ForEach-Object { Write-Host ("still running: {0} (pid {1})" -f $_.Name, $_.ProcessId) }
+  exit 1
+}
+exit 0
diff --git a/tests/test_cmd_crlf.py b/tests/test_cmd_crlf.py
new file mode 100644
index 00000000..e057713e
--- /dev/null
+++ b/tests/test_cmd_crlf.py
@@ -0,0 +1,39 @@
+"""Guard: Windows batch/PowerShell files MUST be CRLF (rant 2026-08-12T12:30:41).
+
+Root cause of the 0.2.25/0.2.26/0.2.27 installer "exit code 1" series: the
+repo's bin/*.cmd were LF-only, so cmd.exe misparsed them (whole file joined
+serially → @echo off ignored → arbitrary commands executed → non-zero exit
+→ installer aborted). .gitattributes (`*.cmd/*.bat/*.ps1 text eol=crlf`)
+enforces CRLF at checkout; this test verifies the working tree never
+regresses (a future PR that adds a LF-only .cmd fails CI).
+"""
+
+import subprocess
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parent.parent
+WIN_SCRIPT_EXTS = (".cmd", ".bat", ".ps1")
+
+
+def _win_scripts():
+    out = subprocess.check_output(["git", "ls-files"], cwd=str(REPO_ROOT), text=True)
+    for rel in out.splitlines():
+        if rel.lower().endswith(WIN_SCRIPT_EXTS):
+            yield REPO_ROOT / rel
+
+
+def test_windows_scripts_are_crlf():
+    files = list(_win_scripts())
+    assert files, "expected at least one tracked .cmd/.bat/.ps1 file"
+    bad = []
+    for p in files:
+        data = p.read_bytes()
+        crlf = data.count(b"\r\n")
+        lf = data.count(b"\n")
+        if crlf != lf:  # bare-LF lines present (LF-only or mixed endings)
+            bad.append(f"{p.relative_to(REPO_ROOT)}: {lf - crlf} bare-LF line(s)")
+    assert not bad, (
+        "Windows scripts must use CRLF line endings (LF-only .cmd files are "
+        "misparsed by cmd.exe → installer 'exit code 1'; see rant "
+        "2026-08-12T12:30:41):\n" + "\n".join(bad)
+    )
diff --git a/tests/test_installer_stop.py b/tests/test_installer_stop.py
index 6d742a9a..fbfeeffd 100644
--- a/tests/test_installer_stop.py
+++ b/tests/test_installer_stop.py
@@ -93,7 +93,11 @@ def test_stop_git_ps1_guilt_by_association():
     assert "Stop-Process -Id $_.ProcessId -Force" in content
     # 退出码语义：无残留（或本来无进程）→ 0；仍有存活 → 1
     assert "exit 1" in content and "exit 0" in content
-    assert 'if ($left.Count -gt 0) { exit 1 } else { exit 0 }' in content
+    # rant 2026-08-12T12:30:41（spec B）：存活检查用最新快照 + 如实报失败——
+    # 幸存进程必须点名输出（不静默吞掉），有存活即 exit 1，绝不误报成功
+    assert 'if ($left.Count -gt 0) {' in content
+    assert "still running: {0} (pid {1})" in content
+    assert "Write-Host" in content
     # 独立脚本 + 非交互（无 cmd 内联转义问题，0.2.26 转义 bug 根因规避）
     assert "$ErrorActionPreference = 'SilentlyContinue'" in content