feat(shared-schemas): add comprehensive SDK schemas validated against real data

- Add type-safe schemas for all Claude Agent SDK message types
- SDKSystemMessageSchema: tools, agents, slash_commands, model, cwd, etc.
- SDKStreamEventMessageSchema: streaming events with delta variations
- SDKAssistantMessageSchema: complete response with usage stats
- SDKResultMessageSchema: modelUsage breakdown, costs, durations
- SDKUsageSchema: token counts, cache stats, service tier
- Add getSDKMessageSchema() helper for type-based schema selection
- Fix file-change-item header height consistency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: fazxes

apps/agent/src/components/git/file-change-item.tsx

@@ -7,6 +7,7 @@ import { DiffViewer } from './diff-viewer';
 import type { FileChange } from '../../stores/file-store';
 
 import { FileIcon } from '@/components/files/file-icon';
+import { HEIGHTS } from '@/lib/constants';
 
 export interface FileChangeItemProps {
   readonly file: FileChange;
@@ -37,11 +38,14 @@ export const FileChangeItem: React.FC<FileChangeItemProps> = ({
   return (
     <div className="bg-background">
       {/* File Header */}
-      <div className="w-full flex items-center gap-2 px-3 py-2">
+      <div
+        className="w-full flex items-center gap-2 px-3 border-b border-border"
+        style={{ height: HEIGHTS.headerBar }}
+      >
         {/* File Button - Clickable with border, takes full width */}
         <button
           onClick={handleFileClick}
-          className="flex items-center gap-2 px-2 py-1 rounded-md border border-border bg-muted/50 hover:bg-accent hover:border-accent transition-colors flex-1 min-w-0"
+          className="flex items-center gap-2 px-2 py-0.5 rounded-md border border-border bg-muted/50 hover:bg-accent hover:border-accent transition-colors flex-1 min-w-0"
         >
           <FileIcon fileName={fileName} className="h-4 w-4 shrink-0" />
           <span className="text-sm font-medium text-foreground truncate flex-1 text-left">

packages/shared-schemas/src/index.ts

@@ -49,16 +49,55 @@ export {
   type ToolCallStatus,
 } from './agent';
 
-// SDK boundary handling
+// SDK boundary handling - comprehensive schemas validated against real SDK data
 export {
+  // Base schemas
+  SDKUsageSchema,
+  SDKModelUsageEntrySchema,
+  SDKModelUsageSchema,
+  // Content block schemas
+  SDKTextBlockSchema,
+  SDKThinkingBlockSchema,
+  SDKToolUseBlockSchema,
+  SDKContentBlockSchema,
+  // Stream event schemas
+  SDKStreamDeltaSchema,
+  SDKStreamMessageSchema,
+  SDKStreamContentBlockSchema,
+  SDKStreamEventPayloadSchema,
+  // Top-level message schemas
+  SDKSystemMessageSchema,
+  SDKStreamEventMessageSchema,
+  SDKAssistantMessageSchema,
+  SDKUserMessageSchema,
+  SDKResultMessageSchema,
+  // Permissive base schema
   SDKMessageSchema,
+  // Tool result
   SDKToolResultSchema,
-  SDKUsageSchema,
+  // Utilities
   processSDKResponse,
+  getSDKMessageSchema,
+  // Types
   type SafeParseResult,
+  type SDKUsage,
+  type SDKModelUsageEntry,
+  type SDKModelUsage,
+  type SDKTextBlock,
+  type SDKThinkingBlock,
+  type SDKToolUseBlock,
+  type SDKContentBlock,
+  type SDKStreamDelta,
+  type SDKStreamMessage,
+  type SDKStreamContentBlock,
+  type SDKStreamEventPayload,
+  type SDKSystemMessage,
+  type SDKStreamEventMessage,
+  type SDKAssistantMessage,
+  type SDKUserMessage,
+  type SDKResultMessage,
   type SDKMessage,
   type SDKToolResult,
-  type SDKUsage,
 } from './sdk';
 
 // Settings schemas with coercion