Witness was calling BuildAgentStartupCommand with empty rigPath,
causing it to fall back to town-level defaults instead of honoring
rig-specific agent settings (like RigSettings.Agent).
Now passes m.rig.Path so rig agent settings are honored, consistent
with how refinery already passes the rig path.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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