refactor: add constant for CLI install lock file name

- Add CLI_INSTALL_LOCK_FILE_NAME constant to centralize lock file naming
- Update bootstrap to use constant instead of hardcoded string
- Improves consistency and maintainability

Author: jdalton

src/constants.mts

@@ -332,6 +332,7 @@ const UPDATE_CHECK_TTL = 24 * 60 * 60 * 1_000
 const UPDATE_NOTIFIER_TIMEOUT = 10_000
 const UPDATE_STORE_DIR = '.socket/_socket'
 const UPDATE_STORE_FILE_NAME = 'update-store.json'
+const CLI_INSTALL_LOCK_FILE_NAME = '.install.lock'
 const UPDATER_BACKUPS_DIR = 'backups'
 const UPDATER_DIR = 'updater'
 const UPDATER_DOWNLOADS_DIR = 'downloads'
@@ -379,6 +380,7 @@ export type Constants = Remap<
     readonly UPDATE_NOTIFIER_TIMEOUT: typeof UPDATE_NOTIFIER_TIMEOUT
     readonly UPDATE_STORE_DIR: typeof UPDATE_STORE_DIR
     readonly UPDATE_STORE_FILE_NAME: typeof UPDATE_STORE_FILE_NAME
+    readonly CLI_INSTALL_LOCK_FILE_NAME: typeof CLI_INSTALL_LOCK_FILE_NAME
     readonly UPDATER_BACKUPS_DIR: typeof UPDATER_BACKUPS_DIR
     readonly UPDATER_DIR: typeof UPDATER_DIR
     readonly UPDATER_DOWNLOADS_DIR: typeof UPDATER_DOWNLOADS_DIR
@@ -1374,6 +1376,7 @@ export {
   UPDATE_NOTIFIER_TIMEOUT,
   UPDATE_STORE_DIR,
   UPDATE_STORE_FILE_NAME,
+  CLI_INSTALL_LOCK_FILE_NAME,
   ENVIRONMENT_YML,
   ERROR_NO_MANIFEST_FILES,
   ERROR_NO_PACKAGE_JSON,

src/sea/bootstrap.mts

@@ -32,6 +32,7 @@ try {
   // eslint-disable-next-line n/no-process-exit
   process.exit(1)
 }
+const CLI_INSTALL_LOCK_FILE_NAME = '.install.lock'
 const DOWNLOAD_MESSAGE_DELAY_MS = 2_000
 const HTTPS_TIMEOUT_MS = 30_000
 const IPC_HANDSHAKE_TIMEOUT_MS = 5_000
@@ -93,7 +94,7 @@ function sanitizeTarballPath(filePath: string): string {
  * Uses a lock file with retries to handle multiple SEA instances starting simultaneously.
  */
 async function acquireLock(): Promise<string> {
-  const lockPath = path.join(SOCKET_CLI_DIR, '.install.lock')
+  const lockPath = path.join(SOCKET_CLI_DIR, CLI_INSTALL_LOCK_FILE_NAME)
 
   for (let attempt = 0; attempt < LOCK_MAX_RETRIES; attempt += 1) {
     try {