refactor: add canonical transcript assembly seam

packages/core/package.json

@@ -11,6 +11,7 @@
     "./parsing": "./dist/parsing.js",
     "./persist": "./dist/persist.js",
     "./provider-indexing": "./dist/provider-indexing.js",
+    "./session-detail": "./dist/session-detail.js",
     "./providers/claude": "./dist/providers/claude.js",
     "./providers/codex": "./dist/providers/codex.js",
     "./providers/kimi": "./dist/providers/kimi.js",
@@ -18,6 +19,7 @@
     "./providers/builtins": "./dist/providers/builtins.js",
     "./providers/types": "./dist/providers/types.js",
     "./query": "./dist/query.js",
+    "./schema-migrations": "./dist/schema-migrations.js",
     "./sqlite-types": "./dist/sqlite-types.js",
     "./tx": "./dist/tx.js",
     "./write-coordinator": "./dist/write-coordinator.js",