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/team-session-events/team-idle-wake-hint.ts

@@ -7,6 +7,7 @@ import {
   applyMemberSessionRouting,
   buildMemberPromptBody,
 } from "../../features/team-mode/member-session-routing"
+import { resolveSessionEventID } from "../../shared/event-session-id"
 import { log } from "../../shared/logger"
 import { settleAfterSessionIdle } from "../shared/session-idle-settle"
 
@@ -35,8 +36,7 @@ export type HookImpl = (input: HookInput) => Promise<void>
 type TeamIdleWakeHintOptions = { idleSettleMs?: number }
 
 function getIdleSessionID(properties: unknown): string | undefined {
-  const record = properties as { sessionID?: string } | undefined
-  return record?.sessionID
+  return resolveSessionEventID(properties)
 }
 
 function buildWakeHint(unreadCount: number): string {

src/hooks/team-session-events/team-lead-orphan-handler.ts

@@ -3,14 +3,14 @@ import type { BackgroundManager } from "../../features/background-agent/manager"
 import { lookupTeamSession } from "../../features/team-mode/team-session-registry"
 import { loadRuntimeState, listActiveTeams, transitionRuntimeState } from "../../features/team-mode/team-state-store/store"
 import type { TmuxSessionManager } from "../../features/tmux-subagent/manager"
+import { resolveSessionEventID } from "../../shared/event-session-id"
 import { log } from "../../shared/logger"
 
 type HookInput = { event: { type: string; properties?: unknown } }
 export type HookImpl = (input: HookInput) => Promise<void>
 
 function getDeletedSessionID(properties: unknown): string | undefined {
-  const record = properties as { info?: { id?: string } } | undefined
-  return record?.info?.id
+  return resolveSessionEventID(properties)
 }
 
 async function findLeadTeamRunId(

src/hooks/team-session-events/team-member-error-handler.ts

@@ -1,14 +1,14 @@
 import type { TeamModeConfig } from "../../config/schema/team-mode"
 import { findResolvedMemberSession } from "../../features/team-mode/member-session-resolution"
 import { loadRuntimeState, transitionRuntimeState } from "../../features/team-mode/team-state-store/store"
+import { resolveSessionEventID } from "../../shared/event-session-id"
 import { log } from "../../shared/logger"
 
 type HookInput = { event: { type: string; properties?: unknown } }
 export type HookImpl = (input: HookInput) => Promise<void>
 
 function getErroredSessionID(properties: unknown): string | undefined {
-  const record = properties as { sessionID?: string } | undefined
-  return record?.sessionID
+  return resolveSessionEventID(properties)
 }
 
 export function createTeamMemberErrorHandler(config: TeamModeConfig): HookImpl {

src/hooks/team-session-events/team-member-status-handler.ts

@@ -2,6 +2,7 @@ import type { TeamModeConfig } from "../../config/schema/team-mode"
 import { findResolvedMemberSession } from "../../features/team-mode/member-session-resolution"
 import { loadRuntimeState, transitionRuntimeState } from "../../features/team-mode/team-state-store/store"
 import type { RuntimeStateMember } from "../../features/team-mode/types"
+import { resolveSessionEventID } from "../../shared/event-session-id"
 import { log } from "../../shared/logger"
 
 type HookInput = { event: { type: string; properties?: unknown } }
@@ -13,13 +14,11 @@ const IDLE_TRANSITION_SOURCE_STATUSES: ReadonlySet<MemberStatus> = new Set(["run
 const COMPLETED_TRANSITION_SOURCE_STATUSES: ReadonlySet<MemberStatus> = new Set(["running", "idle", "pending"])
 
 function getSessionIDFromIdleEvent(properties: unknown): string | undefined {
-  const record = properties as { sessionID?: string } | undefined
-  return record?.sessionID
+  return resolveSessionEventID(properties)
 }
 
 function getSessionIDFromDeletedEvent(properties: unknown): string | undefined {
-  const record = properties as { info?: { id?: string } } | undefined
-  return record?.info?.id
+  return resolveSessionEventID(properties)
 }
 
 async function transitionMemberStatus(