CWD with CD pattern failure

[konard]

🐛 Bug Description

Using `cd` command patterns with command-stream fails to maintain the changed directory context, or the current working directory (CWD) behavior is inconsistent.

🔴 Impact

• Directory navigation doesn't work as expected
• Scripts that depend on `cd` fail
• Build processes that change directories break

📝 Problem Details

```javascript
// ❌ Doesn't maintain directory change
await $`cd /some/directory`;
await $`pwd`; // Still in original directory

// Each command runs in a new shell context
```

🔧 Workaround

Chain commands in single execution:
```javascript
// ✅ Commands in same shell context
await $`cd /some/directory && pwd`;

// Or use Node.js process.chdir()
process.chdir('/some/directory');
```

🎯 Root Cause

Each command-stream invocation creates a new shell, losing directory context between commands.

🔗 References

• Full test: https://github.com/deep-assistant/hive-mind/blob/main/command-stream-issues/issue-14-cwd-with-cd-pattern.mjs