Main's rewritten test_tui_npm_install.py tests call _make_tui_argv expecting
the Ink/npm flow unconditionally; with the dual-engine dispatch merged in,
_resolve_tui_engine() auto-selects opentui whenever ui-opentui/dist is built
in the repo, routing the call away from the path under test (first subprocess
became 'node --version' instead of 'npm run build'). Pin the engine to ink
via an autouse fixture, mirroring the existing pinning precedent in
test_tui_resume_flow.py.
hermes --tui launches the native OpenTUI engine (Bun) when
HERMES_TUI_ENGINE=opentui (env) or display.tui_engine=opentui (config);
Ink stays the default and the shipping path is untouched.
- _resolve_tui_engine() (env > config > ink); refuses opentui on
Windows/Termux (no Bun) -> falls back to ink with a notice.
- _make_opentui_argv() -> [bun, src/entry.real.tsx] (no build step).
- _bun_bin() with HERMES_BUN override.
- Branch at top of _make_tui_argv BEFORE _ensure_tui_node (Bun-only host
must not bootstrap Node).
- Gate _launch_tui NODE_OPTIONS/--max-old-space-size on engine==ink (Bun
is JSC; the V8 flag errors/ignores).
Verified end-to-end via tmux: real hermes --tui -> Bun -> OpenTUI ->
real Python gateway streamed a real reply. No-flag default still ink.
Follow-ups on top of #26016's expensive-model guard:
- gateway/slash_commands.py: typed '/model <name>' now routes through the
expensive-model confirmation gate (slash-confirm buttons / text fallback)
instead of bypassing the guard the pickers enforce. Cancel leaves the
session override and --global config untouched.
- telegram/discord/web_server: run expensive_model_warning() via
asyncio.to_thread — it can hit models.dev or a /models endpoint on a
cache miss, which would otherwise block the event loop.
- telegram: picker callback no longer toasts 'Model switched!' when the
switch callback raised (both mm: and mc: paths).
- tests: new tests/gateway/test_model_command_expensive_confirm.py pins
the typed-path gate (prompt, confirm-once, cancel, cheap-model no-op).
