diff --git a/src/components/ebike/EbikeGPSMap.tsx b/src/components/ebike/EbikeGPSMap.tsx
index 064bcc6..6909930 100644
--- a/src/components/ebike/EbikeGPSMap.tsx
+++ b/src/components/ebike/EbikeGPSMap.tsx
@@ -181,6 +181,8 @@ export const EbikeGPSMap: React.FC<EbikeGPSMapProps> = ({
 
   // Sync texture into uniform when it changes (canvas resize)
   useEffect(() => {
+    // External Three.js material uniform sync — intentional side effect.
+    // eslint-disable-next-line react-hooks/immutability
     shaderMat.uniforms.map.value = texture;
   }, [shaderMat, texture]);
 
@@ -196,6 +198,8 @@ export const EbikeGPSMap: React.FC<EbikeGPSMapProps> = ({
   // Resize the canvas whenever canvasSize changes (texture declared above)
   useEffect(() => {
     Object.assign(offscreenCanvas, { width: canvasSize, height: canvasSize });
+    // External Three.js texture invalidation — intentional side effect.
+    // eslint-disable-next-line react-hooks/immutability
     texture.needsUpdate = true;
   }, [canvasSize, offscreenCanvas, texture]);
 
diff --git a/src/components/ebike/EbikeSpeedmeter.tsx b/src/components/ebike/EbikeSpeedmeter.tsx
index 917f301..1d70f1f 100644
--- a/src/components/ebike/EbikeSpeedmeter.tsx
+++ b/src/components/ebike/EbikeSpeedmeter.tsx
@@ -123,6 +123,8 @@ export function EbikeSpeedmeter({
   );
 
   // ── Frame loop ──────────────────────────────────────────────────────────────
+  /* External Three.js canvas+texture sync — intentional side effects in useFrame. */
+  /* eslint-disable react-hooks/immutability */
   useFrame((_, delta) => {
     // 1. Smooth speed factor
     const target = THREE.MathUtils.clamp(window.ebikeSpeedFactor ?? 0, 0, 1);
@@ -181,6 +183,7 @@ export function EbikeSpeedmeter({
     }
 
     fillTexture.needsUpdate = true;
+    /* eslint-enable react-hooks/immutability */
   });
 
   return (
diff --git a/src/components/gameplay/pylon/PylonDownedPylon.tsx b/src/components/gameplay/pylon/PylonDownedPylon.tsx
index 71923e2..c77c6e3 100644
--- a/src/components/gameplay/pylon/PylonDownedPylon.tsx
+++ b/src/components/gameplay/pylon/PylonDownedPylon.tsx
@@ -30,9 +30,26 @@ export function PylonDownedPylon(): React.JSX.Element | null {
   const straightenStartRef = useRef<number | null>(null);
   const hasPlayedFirstAudioRef = useRef(false);
 
+  const showUpright =
+    isRaised ||
+    mainState !== "pylon" ||
+    step === "waiting" ||
+    step === "inspected" ||
+    step === "fragmented" ||
+    step === "scanning" ||
+    step === "repairing" ||
+    step === "reassembling" ||
+    step === "done" ||
+    step === "narrator-outro";
+
+  const isPylonInteractive = step === "arrived" || step === "npc-return";
+
   useEffect(() => {
     if (step === "arrived") {
       hasPlayedFirstAudioRef.current = false;
+      // Reset the "raised" latch when a new run begins. This is derived
+      // resync from the step prop and runs once per step transition.
+      // eslint-disable-next-line react-hooks/set-state-in-effect
       setIsRaised(false);
     }
   }, [step]);
@@ -62,20 +79,6 @@ export function PylonDownedPylon(): React.JSX.Element | null {
     );
   });
 
-  const showUpright =
-    isRaised ||
-    mainState !== "pylon" ||
-    step === "waiting" ||
-    step === "inspected" ||
-    step === "fragmented" ||
-    step === "scanning" ||
-    step === "repairing" ||
-    step === "reassembling" ||
-    step === "done" ||
-    step === "narrator-outro";
-
-  const isPylonInteractive = step === "arrived" || step === "npc-return";
-
   const beginStraighten = (): void => {
     setIsStraightening(true);
     pylonStraighteningSignal.started = true;
diff --git a/src/components/gameplay/pylon/PylonFarmerNPC.tsx b/src/components/gameplay/pylon/PylonFarmerNPC.tsx
index 638248b..323dd60 100644
--- a/src/components/gameplay/pylon/PylonFarmerNPC.tsx
+++ b/src/components/gameplay/pylon/PylonFarmerNPC.tsx
@@ -34,7 +34,10 @@ const _target = new THREE.Vector3();
  * Compute the Y rotation (radians) for a model whose default forward
  * direction is +Z, so that it faces from `from` toward `to`.
  */
-function faceToward(from: THREE.Vector3, to: readonly [number, number, number]): number {
+function faceToward(
+  from: THREE.Vector3,
+  to: readonly [number, number, number],
+): number {
   const dx = to[0] - from.x;
   const dz = to[2] - from.z;
   return Math.atan2(dx, dz);
@@ -71,6 +74,10 @@ export function PylonFarmerNPC(): React.JSX.Element | null {
   // ─── playAnim ─────────────────────────────────────────────────────────────
   // NOTE: actions is intentionally in the dep array so this callback is
   // recreated when drei's internal state populates the actions map.
+  // External THREE.AnimationAction lifecycle methods (fadeOut/fadeIn/play +
+  // setLoop/clampWhenFinished mutations) are intentional side effects on
+  // drei-managed objects.
+  /* eslint-disable react-hooks/immutability */
   const playAnim = useCallback(
     (name: NPCAnimation, fade = ANIM_FADE): void => {
       if (currentAnimRef.current === name) return;
@@ -89,6 +96,7 @@ export function PylonFarmerNPC(): React.JSX.Element | null {
     },
     [actions],
   );
+  /* eslint-enable react-hooks/immutability */
 
   // ─── Async audio after pylon is raised ────────────────────────────────────
   const playPostRaiseAudioAndAdvance = useCallback(async () => {
@@ -112,6 +120,8 @@ export function PylonFarmerNPC(): React.JSX.Element | null {
 
   // ─── Step-driven animation ────────────────────────────────────────────────
   // Fires when step changes OR when playAnim changes (i.e. when actions load).
+  // playAnim mutates drei-managed AnimationAction internals (intentional).
+  /* eslint-disable react-hooks/immutability */
   useEffect(() => {
     currentAnimRef.current = null;
     if (step === "arrived") {
@@ -168,7 +178,10 @@ export function PylonFarmerNPC(): React.JSX.Element | null {
         currentPosRef.current.lerp(_target, t);
       } else if (!isStraightening && currentAnimRef.current === "walk") {
         playAnim("idle");
-        savedRotationYRef.current = faceToward(currentPosRef.current, PYLON_WORLD_POSITION);
+        savedRotationYRef.current = faceToward(
+          currentPosRef.current,
+          PYLON_WORLD_POSITION,
+        );
       }
       group.position.copy(currentPosRef.current);
     } else if (step === "inspected") {
@@ -180,8 +193,15 @@ export function PylonFarmerNPC(): React.JSX.Element | null {
     }
 
     // ── Rotation ──────────────────────────────────────────────────────────
-    if (step === "npc-return" && !isCompleted && currentAnimRef.current === "walk") {
-      const walkRotY = faceToward(currentPosRef.current, PYLON_FARMER_NPC_WALK_LOOK_AT);
+    if (
+      step === "npc-return" &&
+      !isCompleted &&
+      currentAnimRef.current === "walk"
+    ) {
+      const walkRotY = faceToward(
+        currentPosRef.current,
+        PYLON_FARMER_NPC_WALK_LOOK_AT,
+      );
       group.rotation.set(0, walkRotY, 0);
     } else {
       group.rotation.set(0, savedRotationYRef.current, 0);
@@ -189,6 +209,7 @@ export function PylonFarmerNPC(): React.JSX.Element | null {
 
     group.scale.setScalar(PYLON_FARMER_NPC_AFTER_SCALE);
   });
+  /* eslint-enable react-hooks/immutability */
 
   if (mainState !== "pylon") return null;
   if (step !== "arrived" && step !== "npc-return" && step !== "inspected")