refactor(codex): give the CODEX_HOME lookup its own module

server/lib/codex-ingest.js

@@ -33,6 +33,7 @@
 const fs = require("node:fs");
 const path = require("node:path");
 const os = require("node:os");
+const { getCodexHome } = require("./codex-home");
 
 // `*** Update File: <path>` lines inside an apply_patch heredoc.
 const PATCH_FILE_RE = /^\*\*\* (Add|Update|Delete) File: (.+)$/gm;
@@ -98,10 +99,6 @@ function eventsFromPayload(payload) {
   return [{ tool_name: "Bash", tool_input: { command: commandFromPayload(payload, text) } }];
 }
 
-function codexHome() {
-  return process.env.CODEX_HOME || path.join(os.homedir(), ".codex");
-}
-
 /** Every rollout journal under sessions/, newest mtime first, capped at MAX_FILES. */
 function rolloutFiles() {
   const out = [];
@@ -126,7 +123,7 @@ function rolloutFiles() {
       }
     }
   };
-  walk(path.join(codexHome(), "sessions"), 0);
+  walk(path.join(getCodexHome(), "sessions"), 0);
   return out.sort((a, b) => b.mtime - a.mtime).slice(0, MAX_FILES);
 }