Complex shell commands with nested quotes and variables fail

[konard]

🐛 Bug Description

Complex shell commands with nested quotes, variables, and command substitution fail when using command-stream due to multiple layers of escaping conflicts.

🔴 Impact

• Can't run sophisticated shell scripts
• Pipeline commands with multiple stages fail
• Advanced shell features are unusable

📝 Problem Example

```javascript
// Complex command with nested structures
const cmd = 'for file in *.js; do echo "Processing: $file"; done';
// ❌ Fails due to nested quotes and variables
await $`bash -c "${cmd}"`;
```

🔧 Challenge

Shell commands often require:

• Nested quotes (single within double)
• Variable expansion at different times
• Command substitution
• Complex escaping rules

All of which conflict when passed through command-stream.

🔗 References

• Full test: https://github.com/deep-assistant/hive-mind/blob/main/command-stream-issues/issue-13-complex-shell-escaping.mjs