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/company.ts

@@ -14,6 +14,7 @@ export const updateCompanySchema = createCompanySchema
   .extend({
     status: z.enum(COMPANY_STATUSES).optional(),
     spentMonthlyCents: z.number().int().nonnegative().optional(),
+    requireBoardApprovalForNewAgents: z.boolean().optional(),
   });
 
 export type UpdateCompany = z.infer<typeof updateCompanySchema>;