finish phase 3: type-only codemod and zero non-bridge @atproto/api imports

Task 8: codemod repointed 150 namespace-type files to #/lexicons
(AppBskyFeedDefs.PostView -> app.bsky.feed.defs.PostView, .Record -> .Main)
plus ~105 hand-fixed consumers (composer/video state, DebugMod, Profile,
onboarding, dialogs). DM_SERVICE_HEADERS deleted; last chat call sites on
the chat client. RichText.tsx flipped to SDK-only. Remaining @atproto/api
importers: the three session bridge files, the deliberate dual-world
matcher in lib/xrpc-error.ts, and test fixtures. toLex boundary casts are
TODO(phase4)-tagged for bridge removal.

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

src/state/session/additional-moderation-authorities.ts

@@ -1,7 +1,7 @@
-import {Agent} from '@atproto/api'
 import {Client} from '@atproto/lex-client'
 
 import {device} from '#/storage'
+import {BridgeAgent} from './session-core'
 
 export const BR_LABELER = 'did:plc:ekitcvx7uwnauoqy5oest3hm' // Brazil
 export const DE_LABELER = 'did:plc:r55ow3tocux5kafs5dq445fy' // Germany
@@ -90,9 +90,9 @@ export function configureAdditionalModerationAuthorities() {
    * static - so both emit identical global `atproto-accept-labelers` headers.
    */
   const appLabelers = Array.from(
-    new Set([...Agent.appLabelers, ...additionalLabelers]),
+    new Set([...BridgeAgent.appLabelers, ...additionalLabelers]),
   )
 
   Client.configure({appLabelers: appLabelers as `did:${string}:${string}`[]})
-  Agent.configure({appLabelers})
+  BridgeAgent.configure({appLabelers})
 }