Session Execution

Read docs/SESSION_EXECUTION.md before working in this area. It explains the architecture for reliable command execution with stdout/stderr separation.

Key Concepts

Two execution modes:

• Foreground (exec): Runs in main shell, state persists. Uses temp files for output capture.
• Background (execStream/startProcess): Runs in subshell via FIFOs. Labelers prefix output in background.

Binary prefix contract:

• Stdout: \x01\x01\x01 prefix per line
• Stderr: \x02\x02\x02 prefix per line
• Log parser reconstructs streams from these prefixes

Completion signaling: