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/components/Post/Embed/FeedEmbed.tsx

@@ -1,6 +1,6 @@
 import {useMemo} from 'react'
 
-import {moderateFeedGenerator} from '#/lib/moderation/subjects'
+import {moderateFeedGenerator} from '@bsky.app/sdk/moderation'
 import {useModerationOpts} from '#/state/preferences/moderation-opts'
 import {atoms as a, useTheme} from '#/alf'
 import * as FeedCard from '#/components/FeedCard'

src/components/Post/Embed/ListEmbed.tsx

@@ -1,6 +1,6 @@
 import {useMemo} from 'react'
 
-import {moderateUserList} from '#/lib/moderation/subjects'
+import {moderateUserList} from '@bsky.app/sdk/moderation'
 import {useModerationOpts} from '#/state/preferences/moderation-opts'
 import {atoms as a, useTheme} from '#/alf'
 import * as ListCard from '#/components/ListCard'

src/components/Post/Embed/index.tsx

@@ -1,15 +1,14 @@
 import {useCallback, useMemo} from 'react'
 import {View} from 'react-native'
 import {RichText as RichTextAPI} from '@bsky.app/sdk/richtext'
+import {moderatePost} from '@bsky.app/sdk/moderation'
 import {Trans} from '@lingui/react/macro'
 import {useQueryClient} from '@tanstack/react-query'
 
 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 {asSdkFacets} from '#/lib/strings/rich-text-helpers'
 import {getChatInviteCodeFromUrl} from '#/lib/strings/url-helpers'
 import {useModerationOpts} from '#/state/preferences/moderation-opts'
 import {unstableCacheProfileView} from '#/state/queries/profile'
@@ -287,7 +286,7 @@ export function QuoteEmbed({
     if (!bsky.isType(app.bsky.feed.post, quote.record)) return undefined
     const {text, facets} = quote.record
     return text.trim()
-      ? new RichTextAPI({text: text, facets: asSdkFacets(facets)})
+      ? new RichTextAPI({text: text, facets: facets})
       : undefined
   }, [quote.record])