The in-session slash commands (/model, /reset, /usage, /compress, /voice, ...)
— 42 _handle_*_command handlers, ~3,200 LOC — move out of gateway/run.py into a
mixin GatewayRunner inherits. self._handle_*_command dispatch + all test
references resolve unchanged via the MRO.
Neutral deps (MessageEvent, EphemeralReply, Platform, t, cfg_get, atomic_*_write,
account-usage helpers, stdlib) imported at the mixin top level. The ~10 run.py-
internal helpers (_hermes_home, _load_gateway_config, _resolve_gateway_model,
_AGENT_PENDING_SENTINEL, ...) imported lazily inside the handlers that need them
to avoid an import cycle.
gateway/run.py 19157 -> 15870 LOC; GatewayRunner direct methods 214 -> 172.
Behavior-neutral: voice/update/model/compress command test suites pass; all 42
resolve to the mixin via MRO.
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