chore: apply oxlint autofix (safe level)

Auto-fixed 102 warnings (6040 → 5938) across 57 files. Main categories:
- preserve-caught-error: add { cause: error } to re-thrown errors
- unicorn/no-array-reverse: .reverse() → .toReversed()
- unicorn/no-useless-fallback-in-spread: drop unnecessary ?? {} in spreads
- oxc/no-map-spread: rewrite object spread in .map() to Object.assign
- react-hooks/exhaustive-deps: trim module-level constants from dep arrays

Ran npm run format after to clean up whitespace from lint mutations.

packages/server/src/utils/checkout-git.ts

@@ -1047,15 +1047,17 @@ export async function resolveRepositoryDefaultBranch(repoRoot: string): Promise<
     cwd: repoRoot,
     env: READ_ONLY_GIT_ENV,
   });
-  const branches = stdout
-    .split("\n")
-    .map((line) => line.trim())
-    .filter((line) => line.length > 0);
+  const branches = new Set(
+    stdout
+      .split("\n")
+      .map((line) => line.trim())
+      .filter((line) => line.length > 0),
+  );
 
-  if (branches.includes("main")) {
+  if (branches.has("main")) {
     return "main";
   }
-  if (branches.includes("master")) {
+  if (branches.has("master")) {
     return "master";
   }
 

packages/server/src/utils/spawn.launch-regression.test.ts

@@ -57,7 +57,7 @@ console.log("ARGV_OK");
   if (options?.includeCmdShim !== false) {
     writeFileSync(
       shim,
-      ["@echo off", "setlocal", `\"${fakeDaemonNode}\" \"${assertScript}\" %*`, ""].join("\r\n"),
+      ["@echo off", "setlocal", `"${fakeDaemonNode}" "${assertScript}" %*`, ""].join("\r\n"),
     );
   }