fix(lsp): detect Windows wrapper binaries in installer probes

tests/agent/lsp/test_install_and_lint_fixes.py

@@ -94,6 +94,47 @@ def test_install_npm_works_without_extras(tmp_path, monkeypatch):
     assert install_targets == ["pyright"]
 
 
+def test_existing_binary_finds_windows_wrapper_in_staging(tmp_path, monkeypatch):
+    """Installed Windows shims should satisfy later status/probe calls."""
+    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+
+    from agent.lsp import install as install_mod
+
+    wrapper = install_mod.hermes_lsp_bin_dir() / "pyright-langserver.cmd"
+    wrapper.write_text("@echo off\n")
+    wrapper.chmod(0o755)
+
+    monkeypatch.setattr(install_mod, "_is_windows", lambda: True)
+    monkeypatch.setattr(install_mod.shutil, "which", lambda _name: None)
+
+    assert install_mod._existing_binary("pyright-langserver") == str(wrapper)
+    assert install_mod.detect_status("pyright") == "installed"
+
+
+def test_install_pip_finds_windows_scripts_launcher(tmp_path, monkeypatch):
+    """pip console scripts can land in Scripts/ on native Windows."""
+    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+
+    from agent.lsp import install as install_mod
+
+    def fake_run(cmd, **kwargs):
+        scripts_dir = install_mod.hermes_lsp_bin_dir().parent / "python-packages" / "Scripts"
+        scripts_dir.mkdir(parents=True, exist_ok=True)
+        launcher = scripts_dir / "fake-language-server.exe"
+        launcher.write_text("launcher\n")
+        launcher.chmod(0o755)
+        return MagicMock(returncode=0, stderr="")
+
+    monkeypatch.setattr(install_mod, "_is_windows", lambda: True)
+    monkeypatch.setattr(install_mod.subprocess, "run", fake_run)
+
+    resolved = install_mod._install_pip("fake-lsp", "fake-language-server")
+
+    assert resolved is not None
+    assert resolved.endswith("fake-language-server.exe")
+    assert (install_mod.hermes_lsp_bin_dir() / "fake-language-server.exe").exists()
+
+
 # ---------------------------------------------------------------------------
 # Fix 2: ``hermes lsp status`` surfaces shellcheck-missing for bash
 # ---------------------------------------------------------------------------