Merge Plan: isohash into smarthash

First line: Command to reread CLAUDE.md: cat ~/.claude/CLAUDE.md

Objective

Merge the functionality from @push.rocks/isohash into @push.rocks/smarthash to provide cross-environment hash support (browser and Node.js).

Implementation Steps

1. Create ts_web directory structure ✓

• Create ./ts_web directory for browser-specific code
• This will house the Web Crypto API implementation

2. Add required dependencies ✓

• Add @push.rocks/smartenv to package.json dependencies
• This is needed for environment detection

3. Create web-specific plugin file ✓

• Create ts_web/plugins.ts with smartenv import
• Follow the plugins pattern used in the Node.js version

4. Implement browser-compatible hash functions ✓

• Copy and adapt index.ts from isohash to ts_web/index.ts
• Remove circular dependency (isohash importing smarthash)
• Use native Web Crypto API for SHA256 in browser
• Maintain compatibility with existing smarthash API

5. Build and verify ✓

• Run pnpm build to ensure TypeScript compilation succeeds
• Check that both Node.js and browser builds are created

6. Test functionality ✓

• Run pnpm test to ensure all tests pass
• Verify browser compatibility through web tests

Key Considerations

• The web version uses native Web Crypto API for performance
• The Node.js version continues using the existing crypto implementation
• API remains consistent across both environments
• No breaking changes to existing smarthash functionality

Additional Features Implemented

• Fallback for non-HTTPS environments: Added pure JavaScript SHA256 implementation that automatically activates when crypto.subtle is not available (e.g., HTTP or file:// protocols)
• Comprehensive browser tests: Created test.browser.ts with specific browser environment tests
• Cross-environment consistency: Ensured hash outputs match across Node.js and browser implementations