Update CLAUDE.md

Author: kuzdogan

CLAUDE.md

@@ -25,7 +25,7 @@ This is a React Router v7 SPA application for smart contract verification using
 
 ### Core Architecture
 
-**Verification Flow**: The app supports multiple verification methods (single-file, multiple-files, std-json, metadata-json) for both Solidity and Vyper contracts. All methods eventually convert to standard JSON format before submission to Sourcify's v2 API.
+**Verification Flow**: The app supports multiple verification methods (single-file, multiple-files, std-json, metadata-json, build-info) for both Solidity and Vyper contracts. Framework helpers (hardhat, foundry) provide setup instructions and can optionally use build-info file uploads. All methods eventually convert to standard JSON format before submission to Sourcify's v2 API.
 
 **API Integration**: 
 - `sourcifyApi.ts` - Main Sourcify API client with custom headers for client identification
@@ -52,4 +52,18 @@ This is a React Router v7 SPA application for smart contract verification using
 - TailwindCSS v4 for styling
 - TypeScript with strict mode
 - Path alias: `~/*` maps to `./app/*`
-- Web Workers used for bytecode diff calculations (`public/diffWorker.js`)
+- Web Workers used for bytecode diff calculations (`public/diffWorker.js`)
+
+### Key Features Implemented
+
+**Build-Info File Support**: Framework helpers (Hardhat/Foundry) can toggle between showing setup commands or uploading build-info files. The build-info feature:
+- Parses Hardhat and Foundry build-info JSON files
+- Extracts standard JSON compilation input from the "input" field
+- Auto-populates compiler version from build-info metadata
+- Validates build-info structure and provides helpful error messages
+- Integrates seamlessly with existing std-json submission flow
+
+**Type Safety**: Strong TypeScript typing throughout:
+- `SelectedMethod` union type combines verification methods and framework methods
+- Proper typing for all form validation and state management
+- Type-safe API interfaces and response handling