collapse the dual-world type layer and delete the widening shims

The types/bsky post/profile/starterPack unions drop their @atproto/api arms,
and dangerousIsType/validate go with the old-world guards they wrapped. The
moderation subjects.ts widening shim and rich-text-helpers' asSdkFacets both
existed only to bridge branded and unbranded views, so their 55 and 14 callers
now go straight to @bsky.app/sdk/moderation and the raw facets.

Boundary fallout: lexicon token defs are camelCase schema objects needing
.value, and the branded string slots that the widening used to absorb are now
cast or branded at their producers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/state/queries/usePostThread/views.ts

@@ -1,9 +1,8 @@
-import {type ModerationOpts} from '@bsky.app/sdk/moderation'
+import {moderatePost, type ModerationOpts} from '@bsky.app/sdk/moderation'
 
 import {type $Typed} from '@atproto/lex'
 import {AtUri} from '@atproto/syntax'
 import {app} from '#/lexicons'
-import {moderatePost} from '#/lib/moderation/subjects'
 import {makeProfileLink} from '#/lib/routes/links'
 import {
   type ApiThreadItem,