`hermes -z` has run through the gateway (`_run_oneshot_from_args` ->
`launch_gateway_chat`) at every dispatch site for a while, but the old
in-process runner stayed behind: `hermes_cli.oneshot.run_oneshot` /
`_run_agent` built a bare AIAgent outside the session authority, and
`hermes_cli.main._run_and_exit_oneshot` (with its
`_cleanup_oneshot_runtime` cleanup table) was its only caller. Nothing
outside tests reached any of it.
Delete that path. `hermes_cli.main._exit_after_oneshot` stays exactly as
it is: `--cpu-profile` names it as the one-shot hard-exit path and it
writes the profile before `os._exit`; only its docstring loses the
pointer to the removed cleanup helper. `hermes_cli/oneshot.py` keeps
only what the gateway path and gateway CLI turns still import: the
exit-code mapping, the `--usage-file` ledger with its auxiliary-usage
delta, and `--toolsets` normalization. The process-receipt eval probe
now calls `process_registry.wait_for_pending_completions` directly.
Tests that only exercised the deleted runner are removed; the exit-code
and usage-file tests now call the kept helpers directly; the cost-guard
test patches the gateway launcher instead of the removed function. A new
test pins that `hermes -z` dispatches to `launch_gateway_chat`.
Refs #145171 (EP-11a)
unsupportedpastels
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