refactor(runtime): replace unicode dashes in prompt strings

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

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

src/features/background-agent/process-cleanup.ts

@@ -85,7 +85,7 @@ export function unregisterManagerForCleanup(manager: CleanupTarget): void {
   cleanupRegistered = false
 }
 
-/** @internal — test-only reset for module-level singleton state */
+/** @internal - test-only reset for module-level singleton state */
 export function _resetForTesting(): void {
   for (const manager of [...cleanupManagers]) {
     cleanupManagers.delete(manager)