feat: add stdinContent parameter to shell commands

[bhouston]

Add stdinContent parameter to shell commands

This PR implements the solution for issue #301 by adding a new stdinContent parameter to the shellStart and shellExecute functions, which allows passing content directly to shell commands via stdin.

Changes

• Added stdinContent parameter to shellStart and shellExecute functions
• Implemented cross-platform approach using base64 encoding:
  • For Windows: Uses PowerShell's encoding capabilities
  • For POSIX (Linux/macOS): Uses base64 encoding through pipes
• Updated GitHub mode instructions to use stdinContent instead of temporary files
• Added tests for the new functionality
• Added example test files demonstrating usage

Benefits

1. Simplifies GitHub Integration: No need to create temporary files for GitHub CLI commands
2. Cross-Platform Compatibility: Works consistently on Windows, macOS, and Linux
3. Preserves Formatting: Correctly handles special characters, newlines, and formatting
4. Cleaner Code: Eliminates the need for file creation/cleanup logic

Testing

The implementation has been tested with various input strings containing special characters, including:

• Quotes (single and double)
• Newlines
• Shell operators
• Variables and backticks
• Complex combinations of the above

Example Usage

// Before (using temporary files)
const tempFile = path.join(os.tmpdir(), `issue-${Date.now()}.md`);
fs.writeFileSync(tempFile, issueContent);
await shellExecute({
  command: `gh issue create --title "Test Issue" --body-file "${tempFile}"`,
  description: 'Creating GitHub issue'
});
fs.unlinkSync(tempFile); // Cleanup needed

// After (using stdinContent)
await shellExecute({
  command: 'gh issue create --title "Test Issue" --body-stdin',
  stdinContent: issueContent,
  description: 'Creating GitHub issue'
});
// No cleanup needed!

Closes #301

[github-actions]

🎉 This PR is included in version mycoder-agent-v1.5.0 🎉

The release is available on:

• pnpm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version mycoder-v1.5.0 🎉

The release is available on:

• pnpm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀