Two fixes:
1. Gateway CWD override: TERMINAL_CWD from config.yaml was being
unconditionally overwritten by the messaging_cwd fallback (line 114).
Now explicit paths in config.yaml are respected — only '.' / 'auto' /
'cwd' (or unset) fall back to MESSAGING_CWD or home directory.
2. sandbox_dir config: Added terminal.sandbox_dir to config.yaml bridge
in gateway/run.py, cli.py, and hermes_cli/config.py. Maps to
TERMINAL_SANDBOX_DIR env var, which get_sandbox_dir() reads to
determine where Docker/Singularity sandbox data is stored (default:
~/.hermes/sandboxes/). Users can now set:
hermes config set terminal.sandbox_dir /data/hermes-sandboxes
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