Stop QuoteHydrator from skipping quoted ids on retweets

[Pitchfork-and-Torch]

Bug

Phoenix QuoteHydrator asks TES for quoted tweets by wrapper tweet_id.

get_quoted_tweets reads the quoting tweet's nested quote. That field lives on the original post. A retweet wrapper stores source_tweet_id, not quoted_tweet. quoted_tweet_id / quoted_user_id stay None.

OON retweets are already dropped by OONRetweetReplyFilter. This path is a followed-user retweet of a quote (in-network).

• Entry: Phoenix QuoteHydrator (phoenix_candidate_pipeline.rs, phoenix_scores_pipeline.rs)
• Sink: VFCandidateHydrator puts quoted_tweet_id on TimelineHomeRecommendations; AuthorSocialgraphFilter quoted mute/block; AdsBrandSafetyVfHydrator quoted labels
• Break: TES and cache keyed by candidate.tweet_id instead of get_original_tweet_id() (retweeted_tweet_id.unwrap_or(tweet_id))
• Viewer effect: retweet of a quote of a VF-Drop / blocked / muted inner tweet still serves on For You
• Twin: MediaInfoHydrator, LanguageCodeHydrator, and EngagementCountsHydrator already cache and fetch by get_original_tweet_id()

This is not PR 117 (TES/graph fail-closed). This is not PR 94 (core TES wiping retweet/reply ids). This is not PR 98 (exclude_videos on quotes). This is not PR 23 (mute quoted author when the id is already present).

Fix

Look up and cache TES quoted tweets by candidate.get_original_tweet_id(). Native quotes are unchanged (original == tweet_id). Two retweets of the same quote now share the cache key.

Tests

• Native quote still hydrates when TES is keyed by the candidate id
• Retweet of a quote hydrates when TES only has the original id (fails on unmodified main)
• TES keyed only by the wrapper id does not hydrate a retweet of a quote

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.