fix(plugin): normalize event session ids

Handle OpenCode session events that carry the session ID under properties.info.id or properties.info.sessionID so background tasks and continuation hooks do not miss idle/error/delete events.

Add regression coverage for nested session.idle events completing background tasks and waking continuation hooks.

src/hooks/anthropic-context-window-limit-recovery/recovery-hook.ts

@@ -7,6 +7,7 @@ import { executeCompact, getLastAssistant } from "./executor"
 import { attemptDeduplicationRecovery } from "./deduplication-recovery"
 import { clearSessionState } from "./state"
 import { clearAllSessionTimeouts, clearSessionTimeout } from "./session-timeout-map"
+import { resolveMessageEventSessionID, resolveSessionEventID } from "../../shared/event-session-id"
 import { log } from "../../shared/logger"
 
 export interface AnthropicContextWindowLimitRecoveryOptions {
@@ -53,17 +54,17 @@ export function createAnthropicContextWindowLimitRecoveryHook(
     const props = event.properties as Record<string, unknown> | undefined
 
     if (event.type === "session.deleted") {
-      const sessionInfo = props?.info as { id?: string } | undefined
-      if (sessionInfo?.id) {
-        clearSessionTimeout(pendingCompactionTimeoutBySession, sessionInfo.id)
+      const sessionID = resolveSessionEventID(props)
+      if (sessionID) {
+        clearSessionTimeout(pendingCompactionTimeoutBySession, sessionID)
 
-        clearSessionState(autoCompactState, sessionInfo.id)
+        clearSessionState(autoCompactState, sessionID)
       }
       return
     }
 
     if (event.type === "session.error") {
-      const sessionID = props?.sessionID as string | undefined
+      const sessionID = resolveSessionEventID(props)
       dependencies.log("[auto-compact] session.error received", { sessionID, error: props?.error })
       if (!sessionID) return
 
@@ -120,7 +121,7 @@ export function createAnthropicContextWindowLimitRecoveryHook(
 
     if (event.type === "message.updated") {
       const info = props?.info as Record<string, unknown> | undefined
-      const sessionID = info?.sessionID as string | undefined
+      const sessionID = resolveMessageEventSessionID(props)
 
       if (sessionID && info?.role === "assistant" && info.error) {
         dependencies.log("[auto-compact] message.updated with error", { sessionID, error: info.error })
@@ -137,7 +138,7 @@ export function createAnthropicContextWindowLimitRecoveryHook(
     }
 
     if (event.type === "session.idle") {
-      const sessionID = props?.sessionID as string | undefined
+      const sessionID = resolveSessionEventID(props)
       if (!sessionID) return
 
       if (!autoCompactState.pendingCompact.has(sessionID)) return