fix(server): restore PR detection without HOME

apps/server/src/os-jank.test.ts

@@ -0,0 +1,27 @@
+import { assert, it } from "@effect/vitest";
+
+import { hydratePosixHome } from "./os-jank.ts";
+
+it("hydrates HOME for minimal service environments", () => {
+  const env: NodeJS.ProcessEnv = {};
+
+  hydratePosixHome(env, "/home/service-user");
+
+  assert.equal(env.HOME, "/home/service-user");
+});
+
+it("hydrates a blank HOME value", () => {
+  const env: NodeJS.ProcessEnv = { HOME: " " };
+
+  hydratePosixHome(env, "/home/service-user");
+
+  assert.equal(env.HOME, "/home/service-user");
+});
+
+it("preserves an explicitly configured HOME", () => {
+  const env: NodeJS.ProcessEnv = { HOME: "/custom/home" };
+
+  hydratePosixHome(env, "/home/service-user");
+
+  assert.equal(env.HOME, "/custom/home");
+});

apps/server/src/os-jank.ts

@@ -36,6 +36,12 @@ function hydratePosixPath(env: NodeJS.ProcessEnv, platform: NodeJS.Platform): vo
   }
 }
 
+export function hydratePosixHome(env: NodeJS.ProcessEnv, homeDir = NodeOS.homedir()): void {
+  if ((env.HOME?.trim() ?? "").length === 0 && homeDir.length > 0) {
+    env.HOME = homeDir;
+  }
+}
+
 export const fixPath = Effect.fn("fixPath")(function* (): Effect.fn.Return<
   void,
   never,
@@ -63,10 +69,13 @@ export const fixPath = Effect.fn("fixPath")(function* (): Effect.fn.Return<
 
   if (platform !== "darwin" && platform !== "linux") return;
 
-  yield* Effect.sync(() => hydratePosixPath(env, platform)).pipe(
+  yield* Effect.sync(() => {
+    hydratePosixHome(env);
+    hydratePosixPath(env, platform);
+  }).pipe(
     Effect.catchDefect((defect) =>
       Effect.sync(() => {
-        logPathHydrationWarning("Failed to hydrate PATH from the user environment.", defect);
+        logPathHydrationWarning("Failed to hydrate the user environment.", defect);
       }),
     ),
   );