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news: decode_tick_news proto-only at floor 210 (#629)

* news: decode_tick_news proto-only at floor 210

decode_tick_news was the last text-decoder in news/common/decoders.rs;
gate is PROTOBUF_MARKET_DATA (206), below floor 210, so the text branch
is unreachable in production. Adds decode_tick_news_proto over
proto::TickNews (int64 millis timestamp, verified vs C# sample app),
flips the wrapper to require_proto() over &ResponseMessage, deletes
parse_unix_timestamp + its tests, and adds TickNewsResponse builder +
tick_news() entry point. News test fixtures migrate from
NEWS_ARTICLE_RESPONSE text const to proto_response. plans/ tracker
updated; per-domain count news 1/4/0 -> 0/5/0.

Companion PR B (decode_option_computation, contracts) is in
plans/gate-206-text-decoder-cleanup.md.

* news: /simplify follow-up on tick_news proto decoder

Switch from_unix_timestamp(millis/1000) to from_unix_timestamp_nanos((millis as i128) * 1_000_000). Drops the /1000 truncation and uses the wire actual unit (millis). Add test_decode_tick_news_proto_invalid_timestamp covering the parse_field error path.

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