Three TypeScript clients each declared their own copy of the tui_gateway wire
types and had drifted apart: apps/shared had a partial GatewayEventName union
with a `(string & {})` escape hatch, ui-tui/gatewayTypes.ts a 150-line
discriminated union, and apps/desktop an `RpcEvent<T>` that was field-for-field
the shared GatewayEvent with `type: string`. None matched the emitter:
message.complete lacked warning/status/error/recoverable/error_surface,
tool.start/tool.complete lacked args/result, SessionResumeResponse lacked
session_key/messages_omitted/hydrating/auto_continue/todo_state, three
different ModelOptionProvider shapes disagreed on fields, and all three unions
handled a `tool.progress` event that no Python emitter has ever produced.
Now:
* `apps/shared/src/gateway-events.ts` is the single home: payload interfaces
typed from the Python emitters (file::symbol cited per interface),
`BackendGatewayEventMap` (89 backend names) + `ClientLocalGatewayEventMap`
(5 TUI-synthetic transport events, clearly marked, excluded from the
contract) merged into `GatewayEventMap`; `GatewayEvent<K>` is discriminated
on `type` with `seq` typed. RPC shapes shared by 2+ surfaces live beside it
(ModelOptionProvider = union of every field hermes_cli/inventory.py sets,
incl. pricing_pending/free_tier_pending; SessionResumeResponse<Info>;
SessionListItem with resolved_id; Usage).
* `JsonRpcGatewayClient.on<K>` is keyed by event name; the gateway.ready
heartbeat/replay_epoch and per-frame `seq` reads are typed instead of cast.
* ui-tui and apps/desktop import the shared names; their local duplicates are
deleted (no re-export shims — importers are repointed; the desktop plugin
SDK barrel keeps its public `RpcEvent` name as an alias of GatewayEvent).
web/src repoints ModelOptionProvider/ModelOptionsResponse.
* `tool.progress` handling is removed from the TUI handler/turnController,
desktop event sets/tools handler, shared union, tests, and two docs
(`grep '"tool.progress"' tui_gateway/` = 0 hits; the `display.tool_progress`
config mode is unrelated and untouched).
* `message.complete.warning` (history-commit note from
prompt_turn.py::_complete_turn_payload) is typed and surfaced on both
surfaces through their existing notice paths (TUI pushActivity 'warn',
desktop notify kind 'warning').
Contract: `apps/shared/src/gateway-events.json` is the sorted list of
backend-emitted names. `tests/tui_gateway/test_gateway_event_contract.py`
collects names from the Python emitter side (emit-helper literals, the
`.request → .expire` table, change-watcher table, child delta mirror,
subagent relay, desktop_ui tool emitters, gateway.ready/setup.ready/
browser-controller frames) and asserts emitted == JSON in both directions.
`apps/shared/src/gateway-events.test.ts` asserts BACKEND_EVENT_NAMES (which
the map type is `satisfies`-checked against) == JSON. Sabotage-verified: a
fake JSON name fails both tests; a fake TS name fails tsc + vitest; a fake
Python `_emit("...")` fails pytest.
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