[Feature Request]: Add missing `app.bsky.unspecced` additions

[KC-2001MS]

Summary

Ten app.bsky.unspecced.* lexicons are present upstream but missing from ATProtoKit, spanning two product surfaces: the post thread v2 algorithm and the Explore/onboarding per-rail user suggestions. Each maps cleanly onto an already-wrapped unspecced sibling, so the additions are mechanical. (getAgeAssuranceState and searchStarterPacksSkeleton were dropped from this request — they are already wrapped in ATProtoKit.)

Pain points

• Onboarding rail (getOnboardingSuggestedUsersSkeleton + getSuggestedOnboardingUsers) — no typed access to the onboarding "who to follow" surface.
• Post thread v2 (getPostThreadOtherV2 / getPostThreadV2) is the new threaded view algorithm. Clients on the typed pipeline are stuck on the v1 app.bsky.feed.getPostThread.
• Explore per-rail suggestions — Bluesky's Explore tab has separate rails (Discover / Explore / SeeMore) each backed by a dedicated getSuggestedUsersFor* (+ Skeleton) endpoint. Without these, third-party clients can only show the generic getSuggestedUsers rail.

Considered Alternatives

Raw XRPC per call site — works but every consumer reimplements the same wrapper shape, and unspecced host routing has to be handled correctly each time.

Is this a breaking change?

No

Library Examples

N/A

Additional Context

Missing lexicons

Lexicon	Suggested wrapper
app.bsky.unspecced.getOnboardingSuggestedUsersSkeleton	getOnboardingSuggestedUsersSkeleton(...)
app.bsky.unspecced.getPostThreadOtherV2	getPostThreadOtherV2(uri:...)
app.bsky.unspecced.getPostThreadV2	getPostThreadV2(uri:...)
app.bsky.unspecced.getSuggestedOnboardingUsers	getSuggestedOnboardingUsers(...)
app.bsky.unspecced.getSuggestedUsersForDiscover	getSuggestedUsersForDiscover(...)
app.bsky.unspecced.getSuggestedUsersForDiscoverSkeleton	getSuggestedUsersForDiscoverSkeleton(...)
app.bsky.unspecced.getSuggestedUsersForExplore	getSuggestedUsersForExplore(...)
app.bsky.unspecced.getSuggestedUsersForExploreSkeleton	getSuggestedUsersForExploreSkeleton(...)
app.bsky.unspecced.getSuggestedUsersForSeeMore	getSuggestedUsersForSeeMore(...)
app.bsky.unspecced.getSuggestedUsersForSeeMoreSkeleton	getSuggestedUsersForSeeMoreSkeleton(...)

References

• Lexicon root: https://github.com/bluesky-social/atproto/tree/main/lexicons/app/bsky/unspecced
• Affected directory: Sources/ATProtoKit/Models/Lexicons/app.bsky/Unspecced/, Sources/ATProtoKit/APIReference/AppBskyAPI/

[KC-2001MS]

As we discussed, I've filed the missing features as separate feature requests for tracking. None of them are urgent on my end, so I plan to follow up on each as the need actually arises.

Given that ATLexiconC is on the horizon, please feel free to handle these at your own pace — there's no rush, and it may well make sense to let ATLexiconC cover some of them rather than typing everything out by hand. I'm happy to help and provide corrections whenever it's useful.