refactor: update validation script to reflect prerender: false design

CORE ISSUE RESOLVED:
prerender: true creates contradiction between SSR and CSR rendering modes,
causing infinite loop of blank screens and auth state conflicts.

DESIGN DECISION: prerender: false (final)
- Functional requirement > Performance optimization
- Protects @Authorize pages from prerender static HTML conflicts
- WebAssembly runtime loads completely before rendering interactive content
- All protected pages render correctly after login

VALIDATION CHANGE:
- Removed requirement for 'prerender: true'
- Now validates: InteractiveWebAssemblyRenderMode (any prerender value)
- Rejects: InteractiveServerRenderMode (Blazor Server forbidden)
- Documents: Why prerender: false is architecturally correct

Root cause documented in CLAUDE.md Phase 8.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

scripts/validate_admin_render.sh

@@ -1,7 +1,29 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# Phase 8: WebAssembly 마이그레이션 완료 - App.razor가 TaxBaik.Web.Client로 이동됨
+# Phase 8: WebAssembly 마이그레이션 - 기능 우선 아키텍처 (2026-07-03)
+#
+# DESIGN DECISION: prerender: false (not true)
+#
+# RATIONALE:
+# - prerender: true = SSR (Server-Side Rendering) - 서버가 정적 HTML 미리 생성
+# - InteractiveWebAssembly = CSR (Client-Side Rendering) - 클라이언트에서 동적 렌더링
+# - These are contradictory: cannot prerender interactive WebAssembly content
+#
+# OBSERVED PROBLEM with prerender: true:
+# 1. Unauthenticated users see prerendered HTML (no auth context)
+# 2. AuthorizeRouteView renders nothing (authorized content cannot prerender)
+# 3. After login, WebAssembly tries to render same component differently
+# 4. Conflict: static prerendered HTML vs. dynamic WASM runtime
+#
+# SOLUTION: prerender: false
+# - App boots to blank screen briefly (WebAssembly loading ~0.5-2s)
+# - After load: all protected pages render correctly with auth
+# - No conflicting render modes
+# - Functional > Performance optimization
+#
+# See CLAUDE.md Phase 8 for architecture details.
+
 app_file="TaxBaik.Web.Client/Components/Admin/App.razor"
 login_file="TaxBaik.Web.Client/Components/Admin/Pages/Login.razor"
 
@@ -12,19 +34,23 @@ for file in "$app_file" "$login_file"; do
   fi
 done
 
-if ! grep -nE "InteractiveWebAssemblyRenderMode\\(prerender: true\\)" "$app_file" >/dev/null; then
-  echo "Admin shell must use InteractiveWebAssemblyRenderMode(prerender: true)." >&2
+# Require WebAssemblyRenderMode (regardless of prerender value)
+if ! grep -nE "InteractiveWebAssemblyRenderMode" "$app_file" >/dev/null; then
+  echo "Admin shell must use InteractiveWebAssemblyRenderMode." >&2
   exit 1
 fi
 
-if grep -nE "InteractiveServerRenderMode|prerender: true" "$app_file" | grep -v "InteractiveWebAssemblyRenderMode(prerender: true)" >/dev/null; then
-  echo "Admin shell render mode violation detected." >&2
+# Reject InteractiveServerRenderMode (Blazor Server architecture forbidden)
+if grep -nE "InteractiveServerRenderMode" "$app_file" >/dev/null; then
+  echo "Admin shell must NOT use InteractiveServerRenderMode (Blazor Server)." >&2
   exit 1
 fi
 
-if ! grep -nE "InteractiveWebAssemblyRenderMode\\(prerender: true\\)" "$login_file" >/dev/null; then
-  echo "Login page must use InteractiveWebAssemblyRenderMode(prerender: true)." >&2
+# Login page also requires WebAssembly mode
+if ! grep -nE "InteractiveWebAssemblyRenderMode" "$login_file" >/dev/null; then
+  echo "Login page must use InteractiveWebAssemblyRenderMode." >&2
   exit 1
 fi
 
-echo "Admin render harness passed."
+echo "✅ Admin render harness passed (WebAssembly mode verified)."
+echo "   ℹ️  Note: prerender: false by design (protects @Authorize content from SSR conflicts)"