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/db/src/schema/agents.ts

@@ -26,6 +26,7 @@ export const agents = pgTable(
     runtimeConfig: jsonb("runtime_config").$type<Record<string, unknown>>().notNull().default({}),
     budgetMonthlyCents: integer("budget_monthly_cents").notNull().default(0),
     spentMonthlyCents: integer("spent_monthly_cents").notNull().default(0),
+    permissions: jsonb("permissions").$type<Record<string, unknown>>().notNull().default({}),
     lastHeartbeatAt: timestamp("last_heartbeat_at", { withTimezone: true }),
     metadata: jsonb("metadata").$type<Record<string, unknown>>(),
     createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),