Cross-surface coverage #23768 missed (per review feedback):
- tools/clarify_gateway.py: _ClarifyEntry carries a multi_select flag
(register() accepts it; signature() exposes it to adapters).
_coerce_text_response now parses multi-select replies — comma- or
space-separated numbers ('1,3' / '1 3'), exact labels, dedup — into a
JSON array string that _parse_multi_select_response decodes into a
list. Out-of-range/unknown tokens reject the reply (native button UI)
or fall back to custom text (awaiting_text/'Other' mode).
- gateway/run.py: _clarify_callback_sync accepts multi_select and
registers it on the pending entry.
- gateway/platforms/base.py: default numbered-list text fallback tells
the user multiple selections are allowed and how to reply.
- tui_gateway/server.py: clarify_callback passes multi_select through
the clarify.request payload as a hint; renderers without checkbox
support ignore the field and remain single-select-compatible.
- tests: 13 new gateway tests (flag storage, comma/space/single-number
parsing, label matching, out-of-range rejection, dedup, end-to-end
resolve, single-select regressions).
10b7ab5cb6