diff --git a/src/features/flights-map/index.ts b/src/features/flights-map/index.ts
new file mode 100644
index 00000000..21076ff6
--- /dev/null
+++ b/src/features/flights-map/index.ts
@@ -0,0 +1,2 @@
+// Public barrel for the flights-map feature. See frozen-barrels.md.
+export {};
diff --git a/src/features/online-board/index.ts b/src/features/online-board/index.ts
new file mode 100644
index 00000000..4d678e0c
--- /dev/null
+++ b/src/features/online-board/index.ts
@@ -0,0 +1,5 @@
+// Public barrel for the online-board feature.
+// This file is the ONLY public surface — other sub-plans and features
+// must import exclusively from "@/features/online-board", never from
+// deeper paths. See docs/superpowers/phase-1/frozen-barrels.md for the rule.
+export {};
diff --git a/src/features/popular-requests/index.ts b/src/features/popular-requests/index.ts
new file mode 100644
index 00000000..e56605f8
--- /dev/null
+++ b/src/features/popular-requests/index.ts
@@ -0,0 +1,2 @@
+// Public barrel for the popular-requests feature. See frozen-barrels.md.
+export {};
diff --git a/src/features/schedule/index.ts b/src/features/schedule/index.ts
new file mode 100644
index 00000000..55cf773c
--- /dev/null
+++ b/src/features/schedule/index.ts
@@ -0,0 +1,2 @@
+// Public barrel for the schedule feature. See frozen-barrels.md.
+export {};
diff --git a/src/typecheck-placeholder.ts b/src/typecheck-placeholder.ts
deleted file mode 100644
index cb0ff5c3..00000000
--- a/src/typecheck-placeholder.ts
+++ /dev/null
@@ -1 +0,0 @@
-export {};
diff --git a/src/ui/index.ts b/src/ui/index.ts
new file mode 100644
index 00000000..c041cb42
--- /dev/null
+++ b/src/ui/index.ts
@@ -0,0 +1,3 @@
+// Public barrel for the UI adapter layer. See frozen-barrels.md.
+// Feature code imports UI primitives exclusively through this barrel.
+export {};