diff --git a/build.ts b/build.ts
index 6cb8e73eca..20d4b1478f 100644
--- a/build.ts
+++ b/build.ts
@@ -21,6 +21,7 @@ const result = await Bun.build({
   outdir,
   target: 'bun',
   splitting: true,
+  sourcemap: 'linked',
   define: {
     ...getMacroDefines(),
     // React production mode — eliminates _debugStack Error objects
diff --git a/scripts/dev.ts b/scripts/dev.ts
index 72919caa8c..e572f03878 100644
--- a/scripts/dev.ts
+++ b/scripts/dev.ts
@@ -18,7 +18,7 @@ const defines = {
   ...getMacroDefines(),
   // React production mode — prevents 6,889+ _debugStack Error objects
   // (12MB) from accumulating during long-running sessions.
-  'process.env.NODE_ENV': JSON.stringify('production'),
+  'process.env.NODE_ENV': JSON.stringify('development'),
 }
 
 const defineArgs = Object.entries(defines).flatMap(([k, v]) => [
diff --git a/src/components/FeedbackSurvey/useFrustrationDetection.ts b/src/components/FeedbackSurvey/useFrustrationDetection.ts
index 0419aa5a0d..d88eb2d569 100644
--- a/src/components/FeedbackSurvey/useFrustrationDetection.ts
+++ b/src/components/FeedbackSurvey/useFrustrationDetection.ts
@@ -25,24 +25,24 @@ export function useFrustrationDetection(
   const [state, setState] = useState<FrustrationState>('closed')
 
   const config = getGlobalConfig() as { transcriptShareDismissed?: boolean }
-  if (config.transcriptShareDismissed) {
-    return { state: 'closed', handleTranscriptSelect: () => {} }
-  }
-
-  if (!isPolicyAllowed('product_feedback' as any)) {
-    return { state: 'closed', handleTranscriptSelect: () => {} }
-  }
-
-  if (isLoading || hasActivePrompt || otherSurveyOpen) {
-    return { state: 'closed', handleTranscriptSelect: () => {} }
-  }
+  const policyAllowed = isPolicyAllowed('product_feedback' as any)
+  const shouldSkip =
+    config.transcriptShareDismissed ||
+    !policyAllowed ||
+    isLoading ||
+    hasActivePrompt ||
+    otherSurveyOpen
 
   const frustrated = detectFrustration(messages)
 
-  const effectiveState =
-    frustrated && state === 'closed' ? 'transcript_prompt' : state
+  const effectiveState = shouldSkip
+    ? 'closed'
+    : frustrated && state === 'closed'
+      ? 'transcript_prompt'
+      : state
 
-  function handleTranscriptSelect(choice: string) {
+  const handleTranscriptSelect = (choice: string) => {
+    if (shouldSkip) return
     if (choice === 'yes') {
       void submitTranscriptShare(messages, 'frustration', crypto.randomUUID())
       setState('submitted')
diff --git a/src/components/PromptInput/Notifications.tsx b/src/components/PromptInput/Notifications.tsx
index 65464dcf9e..32af69e441 100644
--- a/src/components/PromptInput/Notifications.tsx
+++ b/src/components/PromptInput/Notifications.tsx
@@ -204,10 +204,14 @@ function NotificationContent({
   }, []);
 
   // Voice state (VOICE_MODE builds only, runtime-gated by GrowthBook)
-  const voiceState = feature('VOICE_MODE') ? useVoiceState(s => s.voiceState) : ('idle' as const);
-  const voiceEnabled = feature('VOICE_MODE') ? useVoiceEnabled() : false;
-  const voiceError = feature('VOICE_MODE') ? useVoiceState(s => s.voiceError) : null;
-  const isBriefOnly = feature('KAIROS') || feature('KAIROS_BRIEF') ? useAppState(s => s.isBriefOnly) : false;
+  const voiceStateRaw = useVoiceState(s => s.voiceState);
+  const voiceState = feature('VOICE_MODE') ? voiceStateRaw : ('idle' as const);
+  const voiceEnabledRaw = useVoiceEnabled();
+  const voiceEnabled = feature('VOICE_MODE') ? voiceEnabledRaw : false;
+  const voiceErrorRaw = useVoiceState(s => s.voiceError);
+  const voiceError = feature('VOICE_MODE') ? voiceErrorRaw : null;
+  const isBriefOnlyState = useAppState(s => s.isBriefOnly);
+  const isBriefOnly = feature('KAIROS') || feature('KAIROS_BRIEF') ? isBriefOnlyState : false;
 
   // When voice is actively recording or processing, replace all
   // notifications with just the voice indicator.
diff --git a/src/components/PromptInput/PromptInput.tsx b/src/components/PromptInput/PromptInput.tsx
index 5291cde222..a37eaa37ec 100644
--- a/src/components/PromptInput/PromptInput.tsx
+++ b/src/components/PromptInput/PromptInput.tsx
@@ -347,8 +347,8 @@ function PromptInput({
   // the input bar. viewingAgentTaskId mirrors the gate on both (Spinner.tsx,
   // REPL.tsx) — teammate view falls back to SpinnerWithVerbInner which has
   // its own marginTop, so the gap stays even without ours.
-  const briefOwnsGap =
-    feature('KAIROS') || feature('KAIROS_BRIEF') ? useAppState(s => s.isBriefOnly) && !viewingAgentTaskId : false;
+  const isBriefOnlyState = useAppState(s => s.isBriefOnly);
+  const briefOwnsGap = feature('KAIROS') || feature('KAIROS_BRIEF') ? isBriefOnlyState && !viewingAgentTaskId : false;
   const mainLoopModel_ = useAppState(s => s.mainLoopModel);
   const mainLoopModelForSession = useAppState(s => s.mainLoopModelForSession);
   const thinkingEnabled = useAppState(s => s.thinkingEnabled);
@@ -2111,7 +2111,8 @@ function PromptInput({
 
   useBuddyNotification();
 
-  const companionSpeaking = feature('BUDDY') ? useAppState(s => s.companionReaction !== undefined) : false;
+  const companionReactionState = useAppState(s => s.companionReaction);
+  const companionSpeaking = feature('BUDDY') ? companionReactionState !== undefined : false;
   const { columns, rows } = useTerminalSize();
   const textInputColumns = columns - 3 - companionReservedColumns(columns, companionSpeaking);
 
diff --git a/src/components/PromptInput/PromptInputFooterLeftSide.tsx b/src/components/PromptInput/PromptInputFooterLeftSide.tsx
index 997fe3e7da..efa2897726 100644
--- a/src/components/PromptInput/PromptInputFooterLeftSide.tsx
+++ b/src/components/PromptInput/PromptInputFooterLeftSide.tsx
@@ -230,9 +230,12 @@ function ModeIndicator({
     proactiveModule?.getNextTickAt ?? NULL,
     NULL,
   );
-  const voiceEnabled = feature('VOICE_MODE') ? useVoiceEnabled() : false;
-  const voiceState = feature('VOICE_MODE') ? useVoiceState(s => s.voiceState) : ('idle' as const);
-  const voiceWarmingUp = feature('VOICE_MODE') ? useVoiceState(s => s.voiceWarmingUp) : false;
+  const voiceEnabledRaw = useVoiceEnabled();
+  const voiceEnabled = feature('VOICE_MODE') ? voiceEnabledRaw : false;
+  const voiceStateRaw = useVoiceState(s => s.voiceState);
+  const voiceState = feature('VOICE_MODE') ? voiceStateRaw : ('idle' as const);
+  const voiceWarmingUpRaw = useVoiceState(s => s.voiceWarmingUp);
+  const voiceWarmingUp = feature('VOICE_MODE') ? voiceWarmingUpRaw : false;
   const hasSelection = useHasSelection();
   const selGetState = useSelection().getState;
   const hasNextTick = nextTickAt !== null;
@@ -250,16 +253,19 @@ function ModeIndicator({
   const escShortcut = useShortcutDisplay('chat:cancel', 'Chat', 'esc').toLowerCase();
   const todosShortcut = useShortcutDisplay('app:toggleTodos', 'Global', 'ctrl+t');
   const killAgentsShortcut = useShortcutDisplay('chat:killAgents', 'Chat', 'ctrl+x ctrl+k');
-  const voiceKeyShortcut = feature('VOICE_MODE') ? useShortcutDisplay('voice:pushToTalk', 'Chat', 'Space') : '';
+  const voiceKeyShortcutRaw = useShortcutDisplay('voice:pushToTalk', 'Chat', 'Space');
+  const voiceKeyShortcut = feature('VOICE_MODE') ? voiceKeyShortcutRaw : '';
   // Captured at mount so the hint doesn't flicker mid-session if another
   // CC instance increments the counter. Incremented once via useEffect the
   // first time voice is enabled in this session — approximates "hint was
   // shown" without tracking the exact render-time condition (which depends
   // on parts/hintParts computed after the early-return hooks boundary).
-  const [voiceHintUnderCap] = feature('VOICE_MODE')
-    ? useState(() => (getGlobalConfig().voiceFooterHintSeenCount ?? 0) < MAX_VOICE_HINT_SHOWS)
-    : [false];
-  const voiceHintIncrementedRef = feature('VOICE_MODE') ? useRef(false) : null;
+  const [voiceHintUnderCapRaw] = useState(
+    () => (getGlobalConfig().voiceFooterHintSeenCount ?? 0) < MAX_VOICE_HINT_SHOWS,
+  );
+  const voiceHintUnderCap = feature('VOICE_MODE') ? voiceHintUnderCapRaw : false;
+  const voiceHintIncrementedRefRaw = useRef(false);
+  const voiceHintIncrementedRef = feature('VOICE_MODE') ? voiceHintIncrementedRefRaw : null;
   useEffect(() => {
     if (feature('VOICE_MODE')) {
       if (!voiceEnabled || !voiceHintUnderCap) return;
diff --git a/src/components/PromptInput/PromptInputQueuedCommands.tsx b/src/components/PromptInput/PromptInputQueuedCommands.tsx
index 1dfec59c75..267635fbf7 100644
--- a/src/components/PromptInput/PromptInputQueuedCommands.tsx
+++ b/src/components/PromptInput/PromptInputQueuedCommands.tsx
@@ -80,7 +80,8 @@ function PromptInputQueuedCommandsImpl(): React.ReactNode {
   // already indent themselves). Gate mirrors the brief-spinner/message
   // check elsewhere — no teammate-view override needed since this
   // component early-returns when viewing a teammate.
-  const useBriefLayout = feature('KAIROS') || feature('KAIROS_BRIEF') ? useAppState(s => s.isBriefOnly) : false;
+  const isBriefOnlyState = useAppState(s => s.isBriefOnly);
+  const useBriefLayout = feature('KAIROS') || feature('KAIROS_BRIEF') ? isBriefOnlyState : false;
 
   // createUserMessage mints a fresh UUID per call; without memoization, streaming
   // re-renders defeat Message's areMessagePropsEqual (compares uuid) → flicker.
diff --git a/src/components/Spinner.tsx b/src/components/Spinner.tsx
index fe5e74fd91..0ef3ab4d5a 100644
--- a/src/components/Spinner.tsx
+++ b/src/components/Spinner.tsx
@@ -78,10 +78,8 @@ export function SpinnerWithVerb(props: Props): React.ReactNode {
   // teammate view needs the real spinner (which shows teammate status).
   const viewingAgentTaskId = useAppState(s => s.viewingAgentTaskId);
   // Hoisted to mount-time — this component re-renders at animation framerate.
-  const briefEnvEnabled =
-    feature('KAIROS') || feature('KAIROS_BRIEF')
-      ? useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_BRIEF), [])
-      : false;
+  const briefEnvEnabledRaw = useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_BRIEF), []);
+  const briefEnvEnabled = feature('KAIROS') || feature('KAIROS_BRIEF') ? briefEnvEnabledRaw : false;
 
   // Runtime gate mirrors isBriefEnabled() but inlined — importing from
   // BriefTool.ts would leak tool-name strings into external builds. Single
diff --git a/src/components/TextInput.tsx b/src/components/TextInput.tsx
index ce3f1379fb..2a4978d913 100644
--- a/src/components/TextInput.tsx
+++ b/src/components/TextInput.tsx
@@ -44,14 +44,18 @@ export default function TextInput(props: Props): React.ReactNode {
   const settings = useSettings();
   const reducedMotion = settings.prefersReducedMotion ?? false;
 
-  const voiceState = feature('VOICE_MODE') ? useVoiceState(s => s.voiceState) : ('idle' as const);
+  const voiceStateRaw = useVoiceState(s => s.voiceState);
+  const voiceState = feature('VOICE_MODE') ? voiceStateRaw : ('idle' as const);
   const isVoiceRecording = voiceState === 'recording';
 
-  const audioLevels = feature('VOICE_MODE') ? useVoiceState(s => s.voiceAudioLevels) : [];
+  const audioLevelsRaw = useVoiceState(s => s.voiceAudioLevels);
+  const audioLevels = feature('VOICE_MODE') ? audioLevelsRaw : [];
   const smoothedRef = useRef<number[]>(new Array(CURSOR_WAVEFORM_WIDTH).fill(0));
 
   const needsAnimation = isVoiceRecording && !reducedMotion;
-  const [animRef, animTime] = feature('VOICE_MODE') ? useAnimationFrame(needsAnimation ? 50 : null) : [() => {}, 0];
+  const [animRefRaw, animTimeRaw] = useAnimationFrame(needsAnimation ? 50 : null);
+  const animRef = feature('VOICE_MODE') ? animRefRaw : () => {};
+  const animTime = feature('VOICE_MODE') ? animTimeRaw : 0;
 
   // Show hint when terminal regains focus and clipboard has an image
   useClipboardImageHint(isTerminalFocused, !!props.onImagePaste);
diff --git a/src/components/messages/AttachmentMessage.tsx b/src/components/messages/AttachmentMessage.tsx
index df47aa8fc2..3d3c418a03 100644
--- a/src/components/messages/AttachmentMessage.tsx
+++ b/src/components/messages/AttachmentMessage.tsx
@@ -39,7 +39,8 @@ type Props = {
 export function AttachmentMessage({ attachment, addMargin, verbose, isTranscriptMode }: Props): React.ReactNode {
   const bg = useSelectedMessageBg();
   // Hoisted to mount-time — per-message component, re-renders on every scroll.
-  const isDemoEnv = feature('EXPERIMENTAL_SKILL_SEARCH') ? useMemo(() => isEnvTruthy(process.env.IS_DEMO), []) : false;
+  const isDemoEnvRaw = useMemo(() => isEnvTruthy(process.env.IS_DEMO), []);
+  const isDemoEnv = feature('EXPERIMENTAL_SKILL_SEARCH') ? isDemoEnvRaw : false;
   // Handle teammate_mailbox BEFORE switch
   if (isAgentSwarmsEnabled() && attachment.type === 'teammate_mailbox') {
     // Filter out idle notifications BEFORE counting - they are hidden in the UI
diff --git a/src/components/messages/UserPromptMessage.tsx b/src/components/messages/UserPromptMessage.tsx
index 5853653cef..c19cffadbb 100644
--- a/src/components/messages/UserPromptMessage.tsx
+++ b/src/components/messages/UserPromptMessage.tsx
@@ -38,27 +38,20 @@ export function UserPromptMessage({ addMargin, param: { text }, isTranscriptMode
   // child renders a label-style layout, and Box backgroundColor paints
   // behind children unconditionally (they can't opt out).
   //
-  // Hooks stay INSIDE feature() ternaries so external builds don't pay
-  // the per-scrollback-message store subscription (useSyncExternalStore
-  // bypasses React.memo). Runtime-gated like isBriefEnabled() but inlined
-  // to avoid pulling BriefTool.ts → prompt.ts tool-name strings into
-  // external builds.
-  const isBriefOnly = feature('KAIROS') || feature('KAIROS_BRIEF') ? useAppState(s => s.isBriefOnly) : false;
-  const viewingAgentTaskId =
-    feature('KAIROS') || feature('KAIROS_BRIEF') ? useAppState(s => s.viewingAgentTaskId) : null;
+  // Hooks must always be called unconditionally to satisfy React rules.
+  // The feature gate is applied to the computed value, not the hook call.
+  const isBriefOnlyState = useAppState(s => s.isBriefOnly);
+  const viewingAgentTaskIdState = useAppState(s => s.viewingAgentTaskId);
   // Hoisted to mount-time — per-message component, re-renders on every scroll.
-  const briefEnvEnabled =
-    feature('KAIROS') || feature('KAIROS_BRIEF')
-      ? useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_BRIEF), [])
-      : false;
+  const briefEnvEnabledState = useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_BRIEF), []);
   const useBriefLayout =
     feature('KAIROS') || feature('KAIROS_BRIEF')
       ? (getKairosActive() ||
           (getUserMsgOptIn() &&
-            (briefEnvEnabled || getFeatureValue_CACHED_MAY_BE_STALE('tengu_kairos_brief', false)))) &&
-        isBriefOnly &&
+            (briefEnvEnabledState || getFeatureValue_CACHED_MAY_BE_STALE('tengu_kairos_brief', false)))) &&
+        isBriefOnlyState &&
         !isTranscriptMode &&
-        !viewingAgentTaskId
+        !viewingAgentTaskIdState
       : false;
 
   // Truncate before the early return so the hook order is stable.
diff --git a/src/components/messages/UserToolResultMessage/UserToolSuccessMessage.tsx b/src/components/messages/UserToolResultMessage/UserToolSuccessMessage.tsx
index 1117de7224..d595ca0bcc 100644
--- a/src/components/messages/UserToolResultMessage/UserToolSuccessMessage.tsx
+++ b/src/components/messages/UserToolResultMessage/UserToolSuccessMessage.tsx
@@ -43,10 +43,9 @@ export function UserToolSuccessMessage({
   shouldCollapseDiffs,
 }: Props): React.ReactNode {
   const [theme] = useTheme();
-  // Hook stays inside feature() ternary so external builds don't pay a
-  // per-scrollback-message store subscription — same pattern as
-  // UserPromptMessage.tsx.
-  const isBriefOnly = feature('KAIROS') || feature('KAIROS_BRIEF') ? useAppState(s => s.isBriefOnly) : false;
+  // Always call hook unconditionally; feature gate applied to the value.
+  const isBriefOnlyState = useAppState(s => s.isBriefOnly);
+  const isBriefOnly = feature('KAIROS') || feature('KAIROS_BRIEF') ? isBriefOnlyState : false;
 
   // Capture classifier approval once on mount, then delete from Map to prevent linear growth.
   // useState lazy initializer ensures the value persists across re-renders.
diff --git a/src/hooks/useGlobalKeybindings.tsx b/src/hooks/useGlobalKeybindings.tsx
index 36a3fb1027..8b88db0c15 100644
--- a/src/hooks/useGlobalKeybindings.tsx
+++ b/src/hooks/useGlobalKeybindings.tsx
@@ -83,7 +83,7 @@ export function GlobalKeybindingHandlers({
 
   // Toggle transcript mode (ctrl+o). Two-way prompt ↔ transcript.
   // Brief view has its own dedicated toggle on ctrl+shift+b.
-  const isBriefOnly = feature('KAIROS') || feature('KAIROS_BRIEF') ? useAppState(s => s.isBriefOnly) : false;
+  const isBriefOnlyState = useAppState(s => s.isBriefOnly);
   const handleToggleTranscript = useCallback(() => {
     if (feature('KAIROS') || feature('KAIROS_BRIEF')) {
       // Escape hatch: GB kill-switch while defaultView=chat was persisted
@@ -95,7 +95,7 @@ export function GlobalKeybindingHandlers({
       const { isBriefEnabled } =
         require('@claude-code-best/builtin-tools/tools/BriefTool/BriefTool.js') as typeof import('@claude-code-best/builtin-tools/tools/BriefTool/BriefTool.js');
       /* eslint-enable @typescript-eslint/no-require-imports */
-      if (!isBriefEnabled() && isBriefOnly && screen !== 'transcript') {
+      if (!isBriefEnabled() && isBriefOnlyState && screen !== 'transcript') {
         setAppState(prev => {
           if (!prev.isBriefOnly) return prev;
           return { ...prev, isBriefOnly: false };
@@ -121,7 +121,7 @@ export function GlobalKeybindingHandlers({
   }, [
     screen,
     setScreen,
-    isBriefOnly,
+    isBriefOnlyState,
     showAllInTranscript,
     setShowAllInTranscript,
     messageCount,
@@ -162,8 +162,8 @@ export function GlobalKeybindingHandlers({
       const { isBriefEnabled } =
         require('@claude-code-best/builtin-tools/tools/BriefTool/BriefTool.js') as typeof import('@claude-code-best/builtin-tools/tools/BriefTool/BriefTool.js');
       /* eslint-enable @typescript-eslint/no-require-imports */
-      if (!isBriefEnabled() && !isBriefOnly) return;
-      const next = !isBriefOnly;
+      if (!isBriefEnabled() && !isBriefOnlyState) return;
+      const next = !isBriefOnlyState;
       logEvent('tengu_brief_mode_toggled', {
         enabled: next,
         gated: false,
@@ -174,7 +174,7 @@ export function GlobalKeybindingHandlers({
         return { ...prev, isBriefOnly: next };
       });
     }
-  }, [isBriefOnly, setAppState]);
+  }, [isBriefOnlyState, setAppState]);
 
   // Register keybinding handlers
   useKeybinding('app:toggleTodos', handleToggleTodos, {
@@ -183,11 +183,10 @@ export function GlobalKeybindingHandlers({
   useKeybinding('app:toggleTranscript', handleToggleTranscript, {
     context: 'Global',
   });
-  if (feature('KAIROS') || feature('KAIROS_BRIEF')) {
-    useKeybinding('app:toggleBrief', handleToggleBrief, {
-      context: 'Global',
-    });
-  }
+  useKeybinding('app:toggleBrief', handleToggleBrief, {
+    context: 'Global',
+    isActive: feature('KAIROS') ? true : feature('KAIROS_BRIEF') ? true : false,
+  });
 
   // Register teammate keybinding
   useKeybinding(
diff --git a/src/hooks/useIssueFlagBanner.ts b/src/hooks/useIssueFlagBanner.ts
index 49161fe952..124d23dde7 100644
--- a/src/hooks/useIssueFlagBanner.ts
+++ b/src/hooks/useIssueFlagBanner.ts
@@ -93,10 +93,6 @@ export function useIssueFlagBanner(
   messages: Message[],
   submitCount: number,
 ): boolean {
-  if (process.env.USER_TYPE !== 'ant') {
-    return false
-  }
-
   const lastTriggeredAtRef = useRef(0)
   const activeForSubmitRef = useRef(-1)
 
@@ -109,6 +105,11 @@ export function useIssueFlagBanner(
     [messages],
   )
 
+  const isAnt = process.env.USER_TYPE === 'ant'
+  if (!isAnt) {
+    return false
+  }
+
   // Keep showing the banner until the user submits another message
   if (activeForSubmitRef.current === submitCount) {
     return true
diff --git a/src/hooks/useReplBridge.tsx b/src/hooks/useReplBridge.tsx
index bd535d8b92..d80db942f8 100644
--- a/src/hooks/useReplBridge.tsx
+++ b/src/hooks/useReplBridge.tsx
@@ -99,11 +99,16 @@ export function useReplBridge(
   messagesRef.current = messages;
   const store = useAppStateStore();
   const { addNotification } = useNotifications();
-  const replBridgeEnabled = feature('BRIDGE_MODE') ? useAppState(s => s.replBridgeEnabled) : false;
-  const replBridgeConnected = feature('BRIDGE_MODE') ? useAppState(s => s.replBridgeConnected) : false;
-  const replBridgeSessionActive = feature('BRIDGE_MODE') ? useAppState(s => s.replBridgeSessionActive) : false;
-  const replBridgeOutboundOnly = feature('BRIDGE_MODE') ? useAppState(s => s.replBridgeOutboundOnly) : false;
-  const replBridgeInitialName = feature('BRIDGE_MODE') ? useAppState(s => s.replBridgeInitialName) : undefined;
+  const replBridgeEnabledRaw = useAppState(s => s.replBridgeEnabled);
+  const replBridgeEnabled = feature('BRIDGE_MODE') ? replBridgeEnabledRaw : false;
+  const replBridgeConnectedRaw = useAppState(s => s.replBridgeConnected);
+  const replBridgeConnected = feature('BRIDGE_MODE') ? replBridgeConnectedRaw : false;
+  const replBridgeSessionActiveRaw = useAppState(s => s.replBridgeSessionActive);
+  const replBridgeSessionActive = feature('BRIDGE_MODE') ? replBridgeSessionActiveRaw : false;
+  const replBridgeOutboundOnlyRaw = useAppState(s => s.replBridgeOutboundOnly);
+  const replBridgeOutboundOnly = feature('BRIDGE_MODE') ? replBridgeOutboundOnlyRaw : false;
+  const replBridgeInitialNameRaw = useAppState(s => s.replBridgeInitialName);
+  const replBridgeInitialName = feature('BRIDGE_MODE') ? replBridgeInitialNameRaw : undefined;
 
   // Initialize/teardown bridge when enabled state changes.
   // Passes current messages as initialMessages so the remote session
diff --git a/src/hooks/useUpdateNotification.ts b/src/hooks/useUpdateNotification.ts
index c9a7b2a77e..539471b551 100644
--- a/src/hooks/useUpdateNotification.ts
+++ b/src/hooks/useUpdateNotification.ts
@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useRef } from 'react'
 import { major, minor, patch } from 'semver'
 
 export function getSemverPart(version: string): string {
@@ -17,18 +17,17 @@ export function useUpdateNotification(
   updatedVersion: string | null | undefined,
   initialVersion: string = MACRO.VERSION,
 ): string | null {
-  const [lastNotifiedSemver, setLastNotifiedSemver] = useState<string | null>(
-    () => getSemverPart(initialVersion),
-  )
+  const lastNotifiedRef = useRef<string | null>(getSemverPart(initialVersion))
 
-  if (!updatedVersion) {
+  const updatedSemver = updatedVersion ? getSemverPart(updatedVersion) : null
+  if (!updatedSemver) {
     return null
   }
 
-  const updatedSemver = getSemverPart(updatedVersion)
-  if (updatedSemver !== lastNotifiedSemver) {
-    setLastNotifiedSemver(updatedSemver)
+  if (updatedSemver !== lastNotifiedRef.current) {
+    lastNotifiedRef.current = updatedSemver
     return updatedSemver
   }
+
   return null
 }
diff --git a/src/hooks/useVoiceIntegration.tsx b/src/hooks/useVoiceIntegration.tsx
index 11c172b312..5d83844598 100644
--- a/src/hooks/useVoiceIntegration.tsx
+++ b/src/hooks/useVoiceIntegration.tsx
@@ -214,9 +214,12 @@ export function useVoiceIntegration({
   // Voice state selectors. useVoiceEnabled = user intent (settings) +
   // auth + GB kill-switch, with the auth half memoized on authVersion so
   // render loops never hit a cold keychain spawn.
-  const voiceEnabled = feature('VOICE_MODE') ? useVoiceEnabled() : false;
-  const voiceState = feature('VOICE_MODE') ? useVoiceState(s => s.voiceState) : ('idle' as const);
-  const voiceInterimTranscript = feature('VOICE_MODE') ? useVoiceState(s => s.voiceInterimTranscript) : '';
+  const voiceEnabledRaw = useVoiceEnabled();
+  const voiceEnabled = feature('VOICE_MODE') ? voiceEnabledRaw : false;
+  const voiceStateRaw = useVoiceState(s => s.voiceState);
+  const voiceState = feature('VOICE_MODE') ? voiceStateRaw : ('idle' as const);
+  const voiceInterimTranscriptRaw = useVoiceState(s => s.voiceInterimTranscript);
+  const voiceInterimTranscript = feature('VOICE_MODE') ? voiceInterimTranscriptRaw : '';
 
   // Set the voice anchor for focus mode (where recording starts via terminal
   // focus, not key hold). Key-hold sets the anchor in stripTrailing.
@@ -377,8 +380,10 @@ export function useVoiceKeybindingHandler({
   const setVoiceState = useSetVoiceState();
   const keybindingContext = useOptionalKeybindingContext();
   const isModalOverlayActive = useIsModalOverlayActive();
-  const voiceEnabled = feature('VOICE_MODE') ? useVoiceEnabled() : false;
-  const voiceState = feature('VOICE_MODE') ? useVoiceState(s => s.voiceState) : 'idle';
+  const voiceEnabledRaw = useVoiceEnabled();
+  const voiceEnabled = feature('VOICE_MODE') ? voiceEnabledRaw : false;
+  const voiceStateRaw = useVoiceState(s => s.voiceState);
+  const voiceState = feature('VOICE_MODE') ? voiceStateRaw : 'idle';
 
   // Find the configured key for voice:pushToTalk from keybinding context.
   // Forward iteration with last-wins (matching the resolver): if a later
diff --git a/src/screens/REPL.tsx b/src/screens/REPL.tsx
index 83eb7f02c4..72bb7e28b9 100644
--- a/src/screens/REPL.tsx
+++ b/src/screens/REPL.tsx
@@ -860,9 +860,8 @@ export function REPL({
     [],
   );
   const disableVirtualScroll = useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL), []);
-  const disableMessageActions = feature('MESSAGE_ACTIONS')
-    ? useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_DISABLE_MESSAGE_ACTIONS), [])
-    : false;
+  const disableMessageActionsRaw = useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_DISABLE_MESSAGE_ACTIONS), []);
+  const disableMessageActions = feature('MESSAGE_ACTIONS') ? disableMessageActionsRaw : false;
 
   // Log REPL mount/unmount lifecycle
   useEffect(() => {
@@ -1552,14 +1551,13 @@ export function REPL({
   // KAIROS build + config.viewerOnly. feature() is build-time constant so
   // the branch is dead-code-eliminated in non-KAIROS builds (same pattern
   // as useUnseenDivider above).
-  const { maybeLoadOlder } = feature('KAIROS')
-    ? useAssistantHistory({
-        config: remoteSessionConfig,
-        setMessages,
-        scrollRef,
-        onPrepend: shiftDivider,
-      })
-    : HISTORY_STUB;
+  const assistantHistoryResult = useAssistantHistory({
+    config: remoteSessionConfig,
+    setMessages,
+    scrollRef,
+    onPrepend: shiftDivider,
+  });
+  const { maybeLoadOlder } = feature('KAIROS') ? assistantHistoryResult : HISTORY_STUB;
   // Compose useUnseenDivider's callbacks with the lazy-load trigger.
   const composedOnScroll = useCallback(
     (sticky: boolean, handle: ScrollBoxHandle) => {
@@ -4941,8 +4939,9 @@ export function REPL({
   const { relayPipeMessage, pipeReturnHadErrorRef } = usePipeRelay();
 
   // Voice input integration (VOICE_MODE builds only)
+  const voiceIntegrationResult = useVoiceIntegration({ setInputValueRaw, inputValueRef, insertTextRef });
   const voice = feature('VOICE_MODE')
-    ? useVoiceIntegration({ setInputValueRaw, inputValueRef, insertTextRef })
+    ? voiceIntegrationResult
     : {
         stripTrailing: () => 0,
         handleKeyEvent: () => {},
@@ -5379,6 +5378,93 @@ export function REPL({
   // Auto-exit viewing mode when teammate completes or errors
   useTeammateViewAutoExit();
 
+  // Get viewed agent task (inlined from selectors for explicit data flow).
+  // viewedAgentTask: teammate OR local_agent — drives the boolean checks
+  // below. viewedTeammateTask: teammate-only narrowed, for teammate-specific
+  // field access (inProgressToolUseIDs).
+  const viewedTask = viewingAgentTaskId ? tasks[viewingAgentTaskId] : undefined;
+  const viewedTeammateTask = viewedTask && isInProcessTeammateTask(viewedTask) ? viewedTask : undefined;
+  const viewedAgentTask = viewedTeammateTask ?? (viewedTask && isLocalAgentTask(viewedTask) ? viewedTask : undefined);
+
+  // Bypass useDeferredValue when streaming text is showing so Messages renders
+  // the final message in the same frame streaming text clears. Also bypass when
+  // not loading — deferredMessages only matters during streaming (keeps input
+  // responsive); after the turn ends, showing messages immediately prevents a
+  // jitter gap where the spinner is gone but the answer hasn't appeared yet.
+  // Only reducedMotion users keep the deferred path during loading.
+  const usesSyncMessages = showStreamingText || !isLoading;
+  // When viewing an agent, never fall through to leader — empty until
+  // bootstrap/stream fills. Closes the see-leader-type-agent footgun.
+  const rawAgentMessages = viewedAgentTask?.messages;
+  // Fork sidechain encodes the user prompt inside a mixed user message alongside
+  // tool_result blocks; surface the prompt as a standalone bubble and strip the
+  // boilerplate text from its original carrier while preserving tool_results.
+  const displayedAgentMessages = useMemo(() => {
+    if (!viewedAgentTask) return undefined;
+    const agentMessages = rawAgentMessages ?? [];
+    if (
+      !isLocalAgentTask(viewedAgentTask) ||
+      viewedAgentTask.agentType !== FORK_SUBAGENT_TYPE ||
+      !viewedAgentTask.prompt
+    ) {
+      return agentMessages;
+    }
+    // Single pass: locate boilerplate carrier, check whether the prompt text is
+    // already present elsewhere, and find the fallback insertion point (after
+    // the last parent assistant tool_use).
+    const trimmedPrompt = viewedAgentTask.prompt.trim();
+    let boilerplateIndex = -1;
+    let lastAssistantToolUseIndex = -1;
+    let promptAlreadyRendered = false;
+    for (let i = 0; i < agentMessages.length; i++) {
+      const m = agentMessages[i]!;
+      if (m.type === 'user' && Array.isArray(m.message?.content)) {
+        const hasBoilerplate = m.message.content.some(isForkBoilerplateTextBlock);
+        if (hasBoilerplate) {
+          boilerplateIndex = i;
+        } else if (!promptAlreadyRendered) {
+          const firstText = m.message.content.find(b => b.type === 'text' && typeof b.text === 'string') as
+            | { type: 'text'; text: string }
+            | undefined;
+          if (firstText && firstText.text.trim() === trimmedPrompt) promptAlreadyRendered = true;
+        }
+        continue;
+      }
+      if (m.type === 'assistant' && Array.isArray(m.message?.content)) {
+        if (m.message.content.some(b => b.type === 'tool_use')) lastAssistantToolUseIndex = i;
+      }
+    }
+
+    const stripped =
+      boilerplateIndex === -1
+        ? agentMessages
+        : agentMessages.map((m, i) => {
+            if (i !== boilerplateIndex) return m;
+            if (!Array.isArray(m.message?.content)) return m;
+            return {
+              ...m,
+              message: {
+                ...m.message,
+                content: m.message.content.filter(b => !isForkBoilerplateTextBlock(b)),
+              },
+            };
+          });
+
+    if (promptAlreadyRendered) return stripped;
+
+    const insertAt = boilerplateIndex !== -1 ? boilerplateIndex + 1 : lastAssistantToolUseIndex + 1;
+    const synthetic = createUserMessage({
+      content: viewedAgentTask.prompt,
+      timestamp: new Date(viewedAgentTask.startTime).toISOString(),
+    });
+    return [...stripped.slice(0, insertAt), synthetic, ...stripped.slice(insertAt)];
+  }, [viewedAgentTask, rawAgentMessages]);
+  const displayedMessages = viewedAgentTask
+    ? (displayedAgentMessages ?? [])
+    : usesSyncMessages
+      ? messages
+      : deferredMessages;
+
   if (screen === 'transcript') {
     // Virtual scroll replaces the 30-message cap: everything is scrollable
     // and memory is bounded by the viewport. Without it, wrapping transcript
@@ -5554,92 +5640,6 @@ export function REPL({
     return transcriptReturn;
   }
 
-  // Get viewed agent task (inlined from selectors for explicit data flow).
-  // viewedAgentTask: teammate OR local_agent — drives the boolean checks
-  // below. viewedTeammateTask: teammate-only narrowed, for teammate-specific
-  // field access (inProgressToolUseIDs).
-  const viewedTask = viewingAgentTaskId ? tasks[viewingAgentTaskId] : undefined;
-  const viewedTeammateTask = viewedTask && isInProcessTeammateTask(viewedTask) ? viewedTask : undefined;
-  const viewedAgentTask = viewedTeammateTask ?? (viewedTask && isLocalAgentTask(viewedTask) ? viewedTask : undefined);
-
-  // Bypass useDeferredValue when streaming text is showing so Messages renders
-  // the final message in the same frame streaming text clears. Also bypass when
-  // not loading — deferredMessages only matters during streaming (keeps input
-  // responsive); after the turn ends, showing messages immediately prevents a
-  // jitter gap where the spinner is gone but the answer hasn't appeared yet.
-  // Only reducedMotion users keep the deferred path during loading.
-  const usesSyncMessages = showStreamingText || !isLoading;
-  // When viewing an agent, never fall through to leader — empty until
-  // bootstrap/stream fills. Closes the see-leader-type-agent footgun.
-  const rawAgentMessages = viewedAgentTask?.messages;
-  // Fork sidechain encodes the user prompt inside a mixed user message alongside
-  // tool_result blocks; surface the prompt as a standalone bubble and strip the
-  // boilerplate text from its original carrier while preserving tool_results.
-  const displayedAgentMessages = useMemo(() => {
-    if (!viewedAgentTask) return undefined;
-    const agentMessages = rawAgentMessages ?? [];
-    if (
-      !isLocalAgentTask(viewedAgentTask) ||
-      viewedAgentTask.agentType !== FORK_SUBAGENT_TYPE ||
-      !viewedAgentTask.prompt
-    ) {
-      return agentMessages;
-    }
-    // Single pass: locate boilerplate carrier, check whether the prompt text is
-    // already present elsewhere, and find the fallback insertion point (after
-    // the last parent assistant tool_use).
-    const trimmedPrompt = viewedAgentTask.prompt.trim();
-    let boilerplateIndex = -1;
-    let lastAssistantToolUseIndex = -1;
-    let promptAlreadyRendered = false;
-    for (let i = 0; i < agentMessages.length; i++) {
-      const m = agentMessages[i]!;
-      if (m.type === 'user' && Array.isArray(m.message?.content)) {
-        const hasBoilerplate = m.message.content.some(isForkBoilerplateTextBlock);
-        if (hasBoilerplate) {
-          boilerplateIndex = i;
-        } else if (!promptAlreadyRendered) {
-          const firstText = m.message.content.find(b => b.type === 'text' && typeof b.text === 'string') as
-            | { type: 'text'; text: string }
-            | undefined;
-          if (firstText && firstText.text.trim() === trimmedPrompt) promptAlreadyRendered = true;
-        }
-        continue;
-      }
-      if (m.type === 'assistant' && Array.isArray(m.message?.content)) {
-        if (m.message.content.some(b => b.type === 'tool_use')) lastAssistantToolUseIndex = i;
-      }
-    }
-
-    const stripped =
-      boilerplateIndex === -1
-        ? agentMessages
-        : agentMessages.map((m, i) => {
-            if (i !== boilerplateIndex) return m;
-            if (!Array.isArray(m.message?.content)) return m;
-            return {
-              ...m,
-              message: {
-                ...m.message,
-                content: m.message.content.filter(b => !isForkBoilerplateTextBlock(b)),
-              },
-            };
-          });
-
-    if (promptAlreadyRendered) return stripped;
-
-    const insertAt = boilerplateIndex !== -1 ? boilerplateIndex + 1 : lastAssistantToolUseIndex + 1;
-    const synthetic = createUserMessage({
-      content: viewedAgentTask.prompt,
-      timestamp: new Date(viewedAgentTask.startTime).toISOString(),
-    });
-    return [...stripped.slice(0, insertAt), synthetic, ...stripped.slice(insertAt)];
-  }, [viewedAgentTask, rawAgentMessages]);
-  const displayedMessages = viewedAgentTask
-    ? (displayedAgentMessages ?? [])
-    : usesSyncMessages
-      ? messages
-      : deferredMessages;
   // Show the placeholder until the real user message appears in
   // displayedMessages. userInputOnProcessing stays set for the whole turn
   // (cleared in resetLoadingState); this length check hides it once