refactor(session): unify event map augmentation entrypoint

packages/compact/compact/src/types.ts

@@ -11,7 +11,7 @@ import type { ContentBlock, TokenUsage } from '@deepseek-ai/dsh-llm'
 import type { CommandId } from '@deepseek-ai/dsh-commands/brand'
 import type { CompactionId } from './brand.ts'
 
-declare module '@deepseek-ai/dsh-session' {
+declare module '@deepseek-ai/dsh-session/types' {
   interface SessionEventMap {
     /**
      * Marks the start of a compaction — log-only, holds the lock until