fix(cli): use POSIX native service paths

src/nativeServices/serviceDoctor.test.ts

@@ -84,7 +84,7 @@ describe("installed native-service mode and definition inspection", () => {
     expect(inferInstalledNativeServiceMode(new Set(["sessiond"]))).toBe("ambiguous");
   });
 
-  it.each(["systemd", "launchd"] as const)("reconstructs an exact installed development input from %s definitions", (kind) => {
+  it.each(["systemd", "launchd"] as const)("reconstructs POSIX development paths from %s definitions on every host", (kind) => {
     const plan = developmentPlan(kind);
     expect(inspectInstalledDevelopmentServiceInput(plan.backend, renderedDefinitions(plan))).toEqual({
       ok: true,
@@ -124,6 +124,19 @@ describe("installed native-service mode and definition inspection", () => {
     });
   });
 
+  it("interprets installed shell executable paths with POSIX semantics", () => {
+    const plan = developmentPlan("systemd");
+    const definitions = renderedDefinitions(plan).map((definition) => ({
+      ...definition,
+      contents: definition.contents.replace('"/bin/zsh"', '"/bin/not-zsh\\\\zsh"'),
+    }));
+
+    const inspection = inspectInstalledDevelopmentServiceInput(plan.backend, definitions);
+    expect(inspection.ok).toBe(false);
+    if (inspection.ok) throw new Error("Expected the POSIX shell basename inspection to fail");
+    expect(inspection.message).toContain("unsupported login shell");
+  });
+
   it("inspects legacy systemd definitions without /usr/bin/env or quoted working directories", () => {
     const plan = developmentPlan("systemd");
     const definitions = renderedDefinitions(plan).map((definition) => ({

src/nativeServices/serviceDoctor.ts

@@ -1,4 +1,4 @@
-import { basename, join } from "node:path";
+import { posix as posixPath } from "node:path";
 import {
   createDevelopmentNativeServicePlan,
   nativeServicePrerequisiteNeedsPathAdvice,
@@ -135,7 +135,7 @@ export function inspectInstalledDevelopmentServiceInput(
     shell: first.shell,
     environment: first.environment,
     workingDirectory: first.workingDirectory,
-    packageJsonPath: join(first.workingDirectory, "package.json"),
+    packageJsonPath: posixPath.join(first.workingDirectory, "package.json"),
   };
   const expectedPlan = createDevelopmentNativeServicePlan(input);
   for (const definition of parsed.value) {
@@ -436,7 +436,7 @@ function parseLaunchdDefinition(
 }
 
 function installedShell(executable: string): InstalledNativeServiceInspection<NativeServiceShell> {
-  const name = basename(executable).replace(/^-/, "");
+  const name = posixPath.basename(executable).replace(/^-/, "");
   if (name !== "bash" && name !== "zsh" && name !== "fish") {
     return { ok: false, message: `Installed service definition uses unsupported login shell ${executable}.` };
   }

src/nativeServices/serviceRendering.test.ts

@@ -70,7 +70,8 @@ describe("native service rendering", () => {
     expect(plist).toContain("<string>exec npm run start:sessiond</string>");
     expect(plist).toContain("<key>WorkingDirectory</key>\n  <string>/checkout with space</string>");
     expect(plist).toContain("<key>PI_WEB_CONFIG</key>\n    <string>/home/user/config with &quot;quote&quot;.json</string>");
-    expect(plist).toContain("<string>/logs/sessiond.log</string>");
+    expect(plist.match(/<string>\/logs\/sessiond\.log<\/string>/gu)).toHaveLength(2);
+    expect(plist).not.toContain("<string>\\logs\\sessiond.log</string>");
     expect(plist).not.toContain("<key>KeepAlive</key>");
   });
 

src/nativeServices/serviceRendering.ts

@@ -1,4 +1,4 @@
-import { join } from "node:path";
+import { posix as posixPath } from "node:path";
 import type {
   NativeServiceId,
   NativeServicePlan,
@@ -42,7 +42,7 @@ export function renderLaunchdPlist(
   const keepAlive = service.restart === "on-failure"
     ? "  <key>KeepAlive</key>\n  <dict>\n    <key>SuccessfulExit</key>\n    <false/>\n  </dict>\n"
     : "";
-  const logPath = join(logDirectory, service.manager.logName);
+  const logPath = posixPath.join(logDirectory, service.manager.logName);
   return `<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">