Follow-up to the salvaged #88281 commits: read gateway.telemetry.session_segments
through hermes_cli.config_effective.load_user_config_effective(), the exact
primitive gateway.run._load_gateway_config() now delegates to, instead of
read_raw_config() + managed overlay. The raw read dropped ${VAR} expansion
(max_turns: ${SEG_TURNS} parsed as 0) and model-key canonicalization.
The same import also rebound TERMINAL_CWD to the home dir in `hermes -z`
(which does not pre-set it like cli.py): the launch dir's AGENTS.md was
never loaded and terminal commands ran in $HOME (#95577). The subprocess
guard now asserts TERMINAL_CWD / HERMES_QUIET / _HERMES_GATEWAY stay unset
too, and the fixtures patch the effective reader, which both the old and
new call paths go through.
Found by the core entrypoint parity E2E matrix (oneshot row, context_file).
d9ec0bcf56