Fix markdown formatting issues in migration documentation

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

PACKAGE_RESTRUCTURING.md

@@ -76,17 +76,15 @@ packages/
 - Thin type re-exports from @objectstack/spec
 
 **Changes:**
-```diff
-- Remove: Driver interface (use @objectstack/spec)
-- Remove: MetadataRegistry types (use @objectstack/runtime)
-- Remove: Context types (use @objectstack/runtime)
-- Remove: Hook types (use @objectstack/runtime)
-- Remove: Action types (use @objectstack/runtime)
-+ Add: QueryPlugin interface
-+ Add: RepositoryPlugin interface
-+ Add: Plugin-specific types
-+ Keep: Query-specific helper types
-```
+- ❌ Remove: Driver interface (use @objectstack/spec)
+- ❌ Remove: MetadataRegistry types (use @objectstack/runtime)
+- ❌ Remove: Context types (use @objectstack/runtime)
+- ❌ Remove: Hook types (use @objectstack/runtime)
+- ❌ Remove: Action types (use @objectstack/runtime)
+- ✅ Add: QueryPlugin interface
+- ✅ Add: RepositoryPlugin interface
+- ✅ Add: Plugin-specific types
+- ✅ Keep: Query-specific helper types
 
 **Migration Steps:**
 1. Create `/packages/core/types/` (new location)

PLUGIN_ARCHITECTURE.md

@@ -7,7 +7,7 @@ This document defines the plugin architecture for ObjectQL 4.0, where the reposi
 ## Design Principles
 
 ### 1. Plugin-First Philosophy
-**Every feature is a plugin.** Even core query functionality is modular and composable.
+**Every feature is a Plugin.** Even core query functionality is modular and composable.
 
 ### 2. Clear Separation of Concerns
 - **@objectstack/runtime**: Application lifecycle, metadata, security, transactions
@@ -581,13 +581,13 @@ My awesome plugin for ObjectQL.
 
 ## Installation
 
-\`\`\`bash
+```bash
 npm install @objectql/my-plugin
-\`\`\`
+```
 
 ## Usage
 
-\`\`\`typescript
+```typescript
 import { createRuntime } from '@objectstack/runtime';
 import { myPlugin } from '@objectql/my-plugin';