Stop Latest Following from ignoring hide-videos

[Pitchfork-and-Torch]

Bug

Latest Following copies exclude_videos onto the query, then never hydrates video duration or runs VideoFilter.

Night Owl maps hits with ..Default::default(), so min_video_duration_ms stays None. Reverse-chron hydrators are TES core data, conversation ancestors, and quoted text. Filters are RT-dedup, muted keyword, and self-reply. Hide-videos is a no-op.

Ranked Following goes through Phoenix, which already has MediaInfoHydrator + VideoFilter, so the same proto flag works there.

• Entry: Following URT QueryBuilder copies proto_query.exclude_videos (server.rs)
• Sink: VideoFilter keeps iff min_video_duration_ms.is_none(), gated on query.exclude_videos
• Break: ReverseChronPostsPipeline constructs no media-info client and does not wire MediaInfoHydrator or VideoFilter
• Viewer effect: user who hid videos still sees followed users' native videos on Latest Following
• Twin: Phoenix For You / Ranked Following already hydrate duration then filter

This is not PR 98 (Phoenix VideoFilter missing quoted-video duration). Reverse-chron has no QuoteHydrator. Do not intern-enable VideoFilter without media-info: duration stays None and every post is kept.

Fix

Construct ProdMediaInfoCacheClient (mock in tests) on reverse-chron. Wire MediaInfoHydrator then VideoFilter. Ranked Following and Phoenix are unchanged.

Tests

• Mock pipeline hydrator/filter counts include the new pair (fails on unmodified main)
• Media-info then VideoFilter drops a native video when exclude_videos is set, keeps a non-video
• VideoFilter stays disabled when the flag is off

cargo: cannot run. Public dump has no Home Mixer manifest.

[Pitchfork-and-Torch]

Parking this intern-stack PR per operator GitHub cleanup (2026-09-08). Hunt notes remain local. Not a reject of the class.

[Pitchfork-and-Torch]

Reopened. This was a serving-path hunt PR parked by mistake during the 2026-09-08 intern-stack cleanup. Not a reject of the class. Leaving it for xAI review.