fix: resolve CI failures in Python tests and admin-compliance build

Python: add missing 'import enum' to compliance/db/models.py shim.
TypeScript: remove duplicate export of useVendorCompliance from
  vendor-compliance/context.tsx (already exported from ./hooks).
Docs: add mandatory pre-push checklist (lint + test + build) to
  AGENTS.python.md and AGENTS.go.md. [guardrail-change]

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

admin-compliance/lib/sdk/vendor-compliance/context.tsx

@@ -268,19 +268,4 @@ export function VendorComplianceProvider({
   )
 }
 
-// ==========================================
-// HOOK
-// ==========================================
-
-export function useVendorCompliance(): VendorComplianceContextValue {
-  const context = useContext(VendorComplianceContext)
-
-  if (!context) {
-    throw new Error(
-      'useVendorCompliance must be used within a VendorComplianceProvider'
-    )
-  }
-
-  return context
-}