fix(provider): sortable_chunk_fields needs required type — handshake was broken
DEPLOY-BREAKER caught by driving the live bind (unit tests + worldtree-dev's
name-only parser + heid-bug-hunt all missed it). bifrost handshake_response
`SortableChunkField` requires BOTH `name` and `type` (additionalProperties:false).
We advertised `[{"name":"updated_at"}]` (no `type`), so the handshake_response
failed wire-schema validation → `bifrost.schema_validation_failed` → the ENTIRE
Bifrost bind (memory + affect) broke, not just the sort. Advertise
`{"name":"updated_at","type":"timestamp"}` (matches the reference; `type` is
advisory-only). Regression guard added to the caps test (asserts required name+type,
no extra keys). Full suite 639 green.
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