fix(pi): keep active runs alive during background sleep

electron/coding-runtime/pi/worker-process.ts

@@ -5,6 +5,7 @@ import {
 } from 'node:child_process';
 import { platform } from 'node:os';
 import { logger } from '../../utils/logger';
+import type { CodingRuntimeDisposeReason } from '../contracts';
 import { PiProcessError, type PiProcessErrorCode } from './process-errors';
 import {
   PiRpcClient,
@@ -49,16 +50,13 @@ export type PiWorkerStopResult = {
 
 export type PiWorkerProofFailure = 'unexpected_exit' | 'protocol_invalidation';
 
-export type PiWorkerStopReason =
+export type PiWorkerStopReason = CodingRuntimeDisposeReason
   | 'app_shutdown'
   | 'idle_eviction'
   | 'queued_suspension'
   | 'stale_resource_rebuild'
   | 'recover'
-  | 'dispose'
-  | 'model_reconfiguration'
   | 'process_capacity_reopen'
-  | 'fork_replacement'
   | 'protocol_invalidation'
   | 'unexpected_exit_cleanup'
   | 'open_failure'
@@ -74,7 +72,11 @@ const PI_WORKER_STOP_REASONS = new Set<PiWorkerStopReason>([
   'queued_suspension',
   'stale_resource_rebuild',
   'recover',
-  'dispose',
+  'background_sleep',
+  'project_deactivated',
+  'project_removed',
+  'conversation_deleted',
+  'auth_cleanup',
   'model_reconfiguration',
   'process_capacity_reopen',
   'fork_replacement',