fix(shared): improve compaction marker and tmux server health

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/shared/compaction-marker.ts

@@ -30,12 +30,16 @@ export function isCompactionMessage(message: CompactionMessageLike): boolean {
   return isCompactionAgent(message.info?.agent ?? message.agent) || hasCompactionPart(message.parts)
 }
 
+export function getCompactionPartStorageDir(messageID: string): string {
+  return join(PART_STORAGE, messageID)
+}
+
 export function hasCompactionPartInStorage(messageID: string | undefined): boolean {
   if (!messageID) {
     return false
   }
 
-  const partDir = join(PART_STORAGE, messageID)
+  const partDir = getCompactionPartStorageDir(messageID)
   if (!existsSync(partDir)) {
     return false
   }

src/shared/tmux/tmux-utils/server-health.ts

@@ -58,4 +58,5 @@ export async function isServerRunning(serverUrl: string): Promise<boolean> {
 export function resetServerCheck(): void {
 	serverAvailable = null
 	serverCheckUrl = null
+	delete (globalThis as Record<symbol, boolean>)[SERVER_RUNNING_KEY]
 }