feat: single-source projection keys via domain ./client/types pure outlets

packages/session-title/session-title/src/index.ts

@@ -17,6 +17,12 @@ import type {
 } from '@deepseek-ai/dsh-session'
 // Type-only: resolves ctx.sessionProjections for the optional unit child.
 import type {} from '@deepseek-ai/dsh-session-projection'
+// The `title` projection-key declaration lives in the client outlet (its one
+// home). A PLAIN side-effect import, not `import type`: declaration emit
+// elides type-only imports, and the aggregate programs resolve this package
+// through its emitted declarations — the merge must survive in index.d.ts.
+// The imported module is types-only, so the runtime edge is an empty module.
+import './client/types.ts'
 import { fallbackSessionTitle, normalizeSessionTitle } from './normalize.ts'
 
 export { fallbackSessionTitle, normalizeSessionTitle, truncateTitleUtf8 } from './normalize.ts'
@@ -103,17 +109,6 @@ declare module '@deepseek-ai/dsh-session' {
   }
 }
 
-declare module '@deepseek-ai/dsh-session-projection/types' {
-  interface SessionProjectionMap {
-    /**
-     * The session's current normalized title — the latest `session/title`
-     * event's text (last-wins), or `null` before the first title lands. A
-     * plain string: the shape the client list rows consume.
-     */
-    title: string | null
-  }
-}
-
 /** Per-session settlement tails for title-capability out-of-band writes. */
 const SESSION_TITLE_WRITE_TAILS = new WeakMap<Session, Promise<void>>()