diff --git a/codex-rs/core/src/context_manager/history.rs b/codex-rs/core/src/context_manager/history.rs
index d92d5b9a0d..5ad389f6c5 100644
--- a/codex-rs/core/src/context_manager/history.rs
+++ b/codex-rs/core/src/context_manager/history.rs
@@ -225,7 +225,7 @@ impl ContextManager {
     }
 
     fn process_item(&self, item: &ResponseItem, policy: TruncationPolicy) -> ResponseItem {
-        let policy_with_serialization_budget = policy.mul(1.2);
+        let policy_with_serialization_budget = policy * 1.2;
         match item {
             ResponseItem::FunctionCallOutput { call_id, output } => {
                 let truncated =
diff --git a/codex-rs/docs/protocol_v1.md b/codex-rs/docs/protocol_v1.md
index 805abb0ea8..7b373a34fc 100644
--- a/codex-rs/docs/protocol_v1.md
+++ b/codex-rs/docs/protocol_v1.md
@@ -173,3 +173,17 @@ sequenceDiagram
     task2->>user: Event::TurnCompleted
     task2->>-user: Event::TaskCompleted
 ```
+
+## Key Events
+
+### SessionConfigured
+
+`Event::SessionConfigured` is emitted once after `Op::ConfigureSession`.
+
+Notable fields:
+- `session_id`: the backend-assigned session identifier (historically named `session_id` for
+  backwards compatibility).
+- `model_family`: model metadata for the model family selected for the session. This matches the
+  `/models` payload shape; the selected model slug is `model_family.slug`.
+- `approval_policy`, `sandbox_policy`, `cwd`: the effective execution and sandbox settings for the
+  session.
diff --git a/codex-rs/tui2/src/lib.rs b/codex-rs/tui2/src/lib.rs
index e31194b5b8..7ab9fa7751 100644
--- a/codex-rs/tui2/src/lib.rs
+++ b/codex-rs/tui2/src/lib.rs
@@ -58,6 +58,8 @@ pub mod live_wrap;
 mod markdown;
 mod markdown_render;
 mod markdown_stream;
+// Model migration prompt UI is no longer used in production; keep it for snapshot tests.
+#[cfg(test)]
 mod model_migration;
 mod notifications;
 pub mod onboarding;
diff --git a/codex-rs/tui2/src/model_migration.rs b/codex-rs/tui2/src/model_migration.rs
index 0b74ad40a5..6e1b7e3c13 100644
--- a/codex-rs/tui2/src/model_migration.rs
+++ b/codex-rs/tui2/src/model_migration.rs
@@ -1,9 +1,12 @@
+#![allow(dead_code)]
+
 use crate::key_hint;
 use crate::render::Insets;
 use crate::render::renderable::ColumnRenderable;
 use crate::render::renderable::Renderable;
 use crate::render::renderable::RenderableExt as _;
 use crate::selection_list::selection_option_row;
+
 use crate::tui::FrameRequester;
 use crate::tui::Tui;
 use crate::tui::TuiEvent;
diff --git a/codex-rs/tui2/src/test_backend.rs b/codex-rs/tui2/src/test_backend.rs
index 47f17e6b93..7fa0e3fdb7 100644
--- a/codex-rs/tui2/src/test_backend.rs
+++ b/codex-rs/tui2/src/test_backend.rs
@@ -25,7 +25,8 @@ pub struct VT100Backend {
 impl VT100Backend {
     /// Creates a new `TestBackend` with the specified width and height.
     pub fn new(width: u16, height: u16) -> Self {
-        crossterm::style::Colored::set_ansi_color_disabled(false);
+        // Force ANSI color output even when the writer isn't a real TTY (e.g., vt100::Parser in tests).
+        crossterm::style::force_color_output(true);
         Self {
             crossterm_backend: CrosstermBackend::new(vt100::Parser::new(height, width, 0)),
         }