feat(integration): wire v2 workstreams together (engine policy/budget, sandbox, tenant checks, order route, docs)

Engine honours org policy and monthly budget, legacy runner skips engine tasks,
sandbox session provisioned on demand, project fallback for threads, reviewer
fallback, tenant checks on project ids, memory reflection respects grants,
expiry worker, MCP pipeline_status, login redirect, sharing settings, e2e smoke.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

packages/contracts/src/index.ts

@@ -836,7 +836,9 @@ export type WsEventType =
   | "pipeline.log"
   | "pipeline.status"
   | "release.live"
-  | "deploy.status";
+  | "deploy.status"
+  // v2 org platform: org memory changed (taught, edited, or reflected on).
+  | "memory.changed";
 
 /** One pushed event, as the browser receives it. */
 export interface WsEvent<T = Record<string, unknown>> {