Scaffold agent permissions, approval comments, and hiring governance types

Add pending_approval agent status, permissions jsonb column, and AgentPermissions
type with canCreateAgents flag. Add approval_comments table and ApprovalComment
type. Extend approval statuses with revision_requested. Add validators for
permission updates, approval revision requests, resubmission, and approval
comments. Add requireBoardApprovalForNewAgents to company update schema.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/shared/src/validators/index.ts

@@ -10,10 +10,13 @@ export {
   updateAgentSchema,
   createAgentKeySchema,
   wakeAgentSchema,
+  agentPermissionsSchema,
+  updateAgentPermissionsSchema,
   type CreateAgent,
   type UpdateAgent,
   type CreateAgentKey,
   type WakeAgent,
+  type UpdateAgentPermissions,
 } from "./agent.js";
 
 export {
@@ -44,8 +47,14 @@ export {
 export {
   createApprovalSchema,
   resolveApprovalSchema,
+  requestApprovalRevisionSchema,
+  resubmitApprovalSchema,
+  addApprovalCommentSchema,
   type CreateApproval,
   type ResolveApproval,
+  type RequestApprovalRevision,
+  type ResubmitApproval,
+  type AddApprovalComment,
 } from "./approval.js";
 
 export {