macOS: Session discovery fails - pgrep -af does not output command line #1

Bug Description

ClawChain cannot discover any Codex/Claude Code sessions on macOS. The dashboard shows zero session cards despite active Codex processes running.

Root Cause

In clawchain/host_monitor.py, the _scan_processes_via_pgrep() function uses pgrep -af . to scan running processes. On Linux, this outputs PID full_command_line, but on macOS the -a flag is not supported the same way — it only outputs bare PIDs (e.g., 1, 192, 35024).

Since _matches_agent() tries to regex-match agent patterns (like codex) against these lines, it never finds a match because the lines contain only numbers.

# Current code — works on Linux, broken on macOS
probe = subprocess.run(
    ["pgrep", "-af", "."],
    capture_output=True, text=True, check=False,
)

macOS pgrep -af . output:

1
192
35024
35025

Linux pgrep -af . output:

35024 node /usr/bin/codex
35025 codex resume

Environment

• macOS Darwin 25.3.0 (arm64)
• GNU bash 3.2.57
• Python 3.12
• ClawChain 0.1.0

Suggested Fix

Replace pgrep -af . with ps -eo pid,args, which outputs PID + full command line on both macOS and Linux. Keep pgrep as a fallback if ps is unavailable.

Steps to Reproduce

1. Install ClawChain on macOS
2. Start a Codex session
3. Run the setup script and open the dashboard
4. Observe that no sessions appear despite ps aux | grep codex showing running processes

🤖 Generated with Claude Code