[codex] Remove unused Rust helpers (#17146)

## Summary

Removes high-confidence unused Rust helper functions and exports across
`codex-tui`, `codex-shell-command`, and utility crates.

The cleanup includes dead TUI helper methods, unused
path/string/elapsed/fuzzy-match utilities, an unused Windows PowerShell
lookup helper, and the unused terminal palette version counter. This
keeps the remaining public surface smaller without changing behavior.

## Validation

- `just fmt`
- `cargo test -p codex-tui -p codex-shell-command -p codex-utils-elapsed
-p codex-utils-fuzzy-match -p codex-utils-string -p codex-utils-path`
- `just fix -p codex-tui -p codex-shell-command -p codex-utils-elapsed
-p codex-utils-fuzzy-match -p codex-utils-string -p codex-utils-path`
- `git diff --check`

codex-rs/tui/src/app_command.rs

@@ -126,11 +126,6 @@ impl AppCommand {
         Self(Op::RealtimeConversationAudio(params))
     }
 
-    #[allow(dead_code)]
-    pub(crate) fn realtime_conversation_text(params: ConversationTextParams) -> Self {
-        Self(Op::RealtimeConversationText(params))
-    }
-
     pub(crate) fn realtime_conversation_close() -> Self {
         Self(Op::RealtimeConversationClose)
     }
@@ -265,16 +260,6 @@ impl AppCommand {
         Self(Op::Review { review_request })
     }
 
-    #[allow(dead_code)]
-    pub(crate) fn kind(&self) -> &'static str {
-        self.0.kind()
-    }
-
-    #[allow(dead_code)]
-    pub(crate) fn as_core(&self) -> &Op {
-        &self.0
-    }
-
     pub(crate) fn into_core(self) -> Op {
         self.0
     }

codex-rs/tui/src/app_server_session.rs

@@ -777,16 +777,6 @@ pub(crate) fn status_account_display_from_auth_mode(
     }
 }
 
-#[allow(dead_code)]
-pub(crate) fn feedback_audience_from_account_email(
-    account_email: Option<&str>,
-) -> FeedbackAudience {
-    match account_email {
-        Some(email) if email.ends_with("@openai.com") => FeedbackAudience::OpenAiEmployee,
-        Some(_) | None => FeedbackAudience::External,
-    }
-}
-
 fn model_preset_from_api_model(model: ApiModel) -> ModelPreset {
     let upgrade = model.upgrade.map(|upgrade_id| {
         let upgrade_info = model.upgrade_info.clone();

codex-rs/tui/src/ascii_animation.rs

@@ -90,11 +90,6 @@ impl AsciiAnimation {
         true
     }
 
-    #[allow(dead_code)]
-    pub(crate) fn request_frame(&self) {
-        self.request_frame.schedule_frame();
-    }
-
     fn frames(&self) -> &'static [&'static str] {
         self.variants[self.variant_idx]
     }

codex-rs/tui/src/chatwidget.rs

@@ -4735,14 +4735,6 @@ impl ChatWidget {
         Self::new_with_op_target(common, CodexOpTarget::AppEvent)
     }
 
-    #[allow(dead_code)]
-    pub(crate) fn new_with_op_sender(
-        common: ChatWidgetInit,
-        codex_op_tx: UnboundedSender<Op>,
-    ) -> Self {
-        Self::new_with_op_target(common, CodexOpTarget::Direct(codex_op_tx))
-    }
-
     fn new_with_op_target(common: ChatWidgetInit, codex_op_target: CodexOpTarget) -> Self {
         let ChatWidgetInit {
             config,

codex-rs/tui/src/live_wrap.rs

@@ -81,11 +81,6 @@ impl RowBuilder {
         self.flush_current_line(/*explicit_break*/ true);
     }
 
-    /// Drain and return all produced rows.
-    pub fn drain_rows(&mut self) -> Vec<Row> {
-        std::mem::take(&mut self.rows)
-    }
-
     /// Return a snapshot of produced rows (non-draining).
     pub fn rows(&self) -> &[Row] {
         &self.rows

codex-rs/tui/src/render/renderable.rs

@@ -200,15 +200,6 @@ impl<'a> ColumnRenderable<'a> {
     pub fn push(&mut self, child: impl Into<Box<dyn Renderable + 'a>>) {
         self.children.push(RenderableItem::Owned(child.into()));
     }
-
-    #[allow(dead_code)]
-    pub fn push_ref<R>(&mut self, child: &'a R)
-    where
-        R: Renderable + 'a,
-    {
-        self.children
-            .push(RenderableItem::Borrowed(child as &'a dyn Renderable));
-    }
 }
 
 pub struct FlexChild<'a> {
@@ -374,15 +365,6 @@ impl<'a> RowRenderable<'a> {
         self.children
             .push((width, RenderableItem::Owned(child.into())));
     }
-
-    #[allow(dead_code)]
-    pub fn push_ref<R>(&mut self, width: u16, child: &'a R)
-    where
-        R: Renderable + 'a,
-    {
-        self.children
-            .push((width, RenderableItem::Borrowed(child as &'a dyn Renderable)));
-    }
 }
 
 pub struct InsetRenderable<'a> {

codex-rs/tui/src/terminal_palette.rs

@@ -1,13 +1,5 @@
 use crate::color::perceptual_distance;
 use ratatui::style::Color;
-use std::sync::atomic::AtomicU64;
-use std::sync::atomic::Ordering;
-
-static DEFAULT_PALETTE_VERSION: AtomicU64 = AtomicU64::new(0);
-
-fn bump_palette_version() {
-    DEFAULT_PALETTE_VERSION.fetch_add(1, Ordering::Relaxed);
-}
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum StdoutColorLevel {
@@ -56,7 +48,6 @@ pub fn best_color(target: (u8, u8, u8)) -> Color {
 
 pub fn requery_default_colors() {
     imp::requery_default_colors();
-    bump_palette_version();
 }
 
 #[derive(Clone, Copy)]
@@ -77,14 +68,6 @@ pub fn default_bg() -> Option<(u8, u8, u8)> {
     default_colors().map(|c| c.bg)
 }
 
-/// Returns a monotonic counter that increments whenever `requery_default_colors()` runs
-/// successfully so cached renderers can know when their styling assumptions (e.g.
-/// background colors baked into cached transcript rows) are stale and need invalidation.
-#[allow(dead_code)]
-pub fn palette_version() -> u64 {
-    DEFAULT_PALETTE_VERSION.load(Ordering::Relaxed)
-}
-
 #[cfg(all(unix, not(test)))]
 mod imp {
     use super::DefaultColors;