[fa0311]

Stacked on #124. Six operations that the X web client issues but the spec did not cover, found in a browser HAR capture the maintainer provided. Each is typed from recordings only (sandbox account, 2026-10-17; the HAR bodies as extra samples) and registered in placeholder.json with the canonical sample values (elonmusk / 44196397).

operation	API class	what it returns	samples
AboutAccountQuery	UserApi	the "About this account" panel: join date, where the account is based, username changes, verification. The result is a reduced User plus about_profile, so it has its own type (AboutAccountUser) rather than widening User.	2
SidebarUserRecommendations	UsersApi	who to follow in a profile's sidebar (token + UserResults)	4
BroadcastQuery	DefaultApi	a live video broadcast by id (state, timings, viewer counts, Periscope user, the announcing post)	7
AudioSpaceById	DefaultApi	a Space by id: metadata, participants (admins / speakers / listeners carry a reduced user: label, blue verified, verification without verified), the announcing post, sharings	3
useStoryTopicQuery	DefaultApi	AI-written explore stories of a topic (rest_id: "For You"), new typename AiTrend	2
grokAccountJwtQuery	DefaultApi	whether the account is linked to a Grok account	2

Also:

• IdentityProfileLabelsHighlightedLabel is a new shared schema in schemas/user.yaml (same key and backend object on the about panel and on space participants).
• test/python/test_serialize.py resolves placeholder keys case-insensitively, so operations whose name starts lowercase (useStoryTopicQuery, grokAccountJwtQuery) are now exercised by the strict test.

Skipped on purpose (niche, and each would be a live call in every strict run): UserSportsProfile, NflScoresSidebarFollow, SportsLeagueFollow, MLBTeams, MLBSchedule.

Verification

• 831 stored responses deserialize at match rate exactly 1.0, including the 26 samples of the six operations.
• Strict live test: 130 calls (the six new operations included), 129 at match rate exactly 1.0; the remaining call was an HTTP 503 from X on UserRepliesTimeline, not a spec issue. 6 responses with partial errors beside complete data are logged as warnings.

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