Reduce all stages to 4 items, stabilize action detection

- Communication: 6 words → 4 words
- Preparation: 6 actions → 4 actions (wave, touch_nose, clap, raise_arms)
- Action detection: require 8 consecutive frames (was 5) for more stable detection
- Adjusted min criteria gates accordingly

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Partha-dev01

app/intake/communication/page.tsx

@@ -65,7 +65,7 @@ export default function CommunicationPage() {
         const res = await fetch("/api/chat/generate-words", {
           method: "POST",
           headers: { "Content-Type": "application/json" },
-          body: JSON.stringify({ ageMonths, count: 6, mode: "words" }),
+          body: JSON.stringify({ ageMonths, count: 4, mode: "words" }),
         });
         if (!cancelled && res.ok) {
           const data = await res.json();

app/intake/preparation/page.tsx

@@ -14,11 +14,11 @@ const STEPS = [
 ];
 const STEP_IDX = 5;
 
-const ACTIONS: ActionId[] = ["wave", "touch_nose", "clap", "raise_arms", "touch_head", "touch_ears"];
+const ACTIONS: ActionId[] = ["wave", "touch_nose", "clap", "raise_arms"];
 const ACTION_TIMEOUT_MS = 15_000;
 const SUCCESS_DISPLAY_MS = 1500;
 const COUNTDOWN_SECONDS = 3;
-const MIN_DETECTED = 3; // Criteria gate
+const MIN_DETECTED = 2; // Criteria gate
 
 type Phase = "pre_start" | "active" | "complete";
 type ActionPhase = "countdown" | "detecting" | "detected" | "timeout";

app/lib/actions/actionDetector.ts

@@ -229,7 +229,7 @@ export function detectAction(
 
 // ── Sustained detection tracker ─────────────────────────────────────
 
-const REQUIRED_CONSECUTIVE = 5;
+const REQUIRED_CONSECUTIVE = 8;
 
 export class ActionTracker {
   private consecutiveHits = 0;