diff --git a/docs/epics/epic-13-resolution.md b/docs/epics/epic-13-resolution.md
index 7f062a4b..223516cd 100644
--- a/docs/epics/epic-13-resolution.md
+++ b/docs/epics/epic-13-resolution.md
@@ -107,9 +107,19 @@ files created:
 
 ---
 
-### task 4 — mosaic tui
+### task 4 — tui (mosaic → tamboui)
 
-implemented a new `apps/tui` Gradle module with a Mosaic-based interactive terminal UI.
+implemented a new `apps/tui` Gradle module with an interactive terminal UI.
+originally built on Mosaic 0.18; migrated to tamboui 0.2.1-SNAPSHOT after the
+event-loop refactor (`b95135e`) split renderer-agnostic subsystems out. the
+migration replaced the hand-assembled string frames with a real cell buffer,
+widget catalog, and layout engine; domain core (`state/`, `reducer/`, `ws/`,
+`input/`) was untouched. layout now matches the epic-13 reference mockup:
+each panel sits in a titled `ROUNDED` `Block`, status row shows ●/○ +
+provider + session count, session rows uppercase status with an "awaiting
+approval" override, and the keybinds row pins to the bottom. see spec at
+`docs/specs/2026-05-17-tamboui-migration.md`; commits `b267982`
+(migration) and `46951ea` (visual polish).
 
 architecture:
 - single WS listener coroutine updates `mutableStateOf(TuiState)` — no polling