feat(hooks): add /stop-continuation command to halt all continuation mechanisms (#1316)

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

Co-authored-by: justsisyphus <justsisyphus@users.noreply.github.com>
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/todo-continuation-enforcer.ts

@@ -18,12 +18,14 @@ const DEFAULT_SKIP_AGENTS = ["prometheus", "compaction"]
 export interface TodoContinuationEnforcerOptions {
   backgroundManager?: BackgroundManager
   skipAgents?: string[]
+  isContinuationStopped?: (sessionID: string) => boolean
 }
 
 export interface TodoContinuationEnforcer {
   handler: (input: { event: { type: string; properties?: unknown } }) => Promise<void>
   markRecovering: (sessionID: string) => void
   markRecoveryComplete: (sessionID: string) => void
+  cancelAllCountdowns: () => void
 }
 
 interface Todo {
@@ -95,7 +97,7 @@ export function createTodoContinuationEnforcer(
   ctx: PluginInput,
   options: TodoContinuationEnforcerOptions = {}
 ): TodoContinuationEnforcer {
-  const { backgroundManager, skipAgents = DEFAULT_SKIP_AGENTS } = options
+  const { backgroundManager, skipAgents = DEFAULT_SKIP_AGENTS, isContinuationStopped } = options
   const sessions = new Map<string, SessionState>()
 
   function getState(sessionID: string): SessionState {
@@ -420,6 +422,11 @@ export function createTodoContinuationEnforcer(
         return
       }
 
+      if (isContinuationStopped?.(sessionID)) {
+        log(`[${HOOK_NAME}] Skipped: continuation stopped for session`, { sessionID })
+        return
+      }
+
       startCountdown(sessionID, incompleteCount, todos.length, resolvedInfo)
       return
     }
@@ -485,9 +492,17 @@ export function createTodoContinuationEnforcer(
     }
   }
 
+  const cancelAllCountdowns = (): void => {
+    for (const sessionID of sessions.keys()) {
+      cancelCountdown(sessionID)
+    }
+    log(`[${HOOK_NAME}] All countdowns cancelled`)
+  }
+
   return {
     handler,
     markRecovering,
     markRecoveryComplete,
+    cancelAllCountdowns,
   }
 }