Implements ReadableStream interface for shell stdout and stderr, allowing
real-time consumption of command output instead of waiting for buffering.
- Created ShellOutputStream.zig implementing ReadableStream source
- Added stdout/stderr getters to ShellInterpreter returning streams
- Exposed streams on ShellPromise in shell.ts
- Added data notification hooks in Cmd.zig and Builtin.zig
- Updated TypeScript definitions in shell.d.ts
- Added comprehensive tests in shell-streaming.test.ts
The streams are lazily created on first access and share the same
underlying ByteList buffer used for buffered output. Data notifications
wake pending reads when new output arrives.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
