diff --git a/.gitignore b/.gitignore
index 97fd3d1..5bc5244 100644
--- a/.gitignore
+++ b/.gitignore
@@ -109,3 +109,8 @@ Thumbs.db
 ui/node_modules
 navigator/.venv
 
+# Context Engineering
+BETA_README.md
+DAY8_COMPLETE_SUMMARY.md
+SPRINT_B_SUMMARY.md
+
diff --git a/navigator/app/config.py b/navigator/app/config.py
index f06c6f9..11a162e 100644
--- a/navigator/app/config.py
+++ b/navigator/app/config.py
@@ -1,4 +1,5 @@
-from pydantic import BaseSettings, Field
+from pydantic import Field
+from pydantic_settings import BaseSettings
 from pathlib import Path
 from typing import Optional
 
diff --git a/navigator/app/main.py b/navigator/app/main.py
index e474bc2..3c0ea42 100644
--- a/navigator/app/main.py
+++ b/navigator/app/main.py
@@ -40,9 +40,13 @@
     allow_headers=["*"]
 )
 
-# Serve static assets
-app.mount("/images", StaticFiles(directory=os.path.join(DATA_DIR, "images")), name="images")
-app.mount("/plans", StaticFiles(directory=os.path.join(DATA_DIR, "plans")), name="plans")
+# Serve static assets (only mount if directories exist)
+images_dir = os.path.join(DATA_DIR, "images")
+plans_dir = os.path.join(DATA_DIR, "plans")
+if os.path.isdir(images_dir):
+    app.mount("/images", StaticFiles(directory=images_dir), name="images")
+if os.path.isdir(plans_dir):
+    app.mount("/plans", StaticFiles(directory=plans_dir), name="plans")
 
 # ---- Lazy singletons ----
 _store: FaissStore | None = None
@@ -159,7 +163,10 @@ async def _startup_warm():
     def _warm():
         try:
             get_store()
-            get_model_and_transform()
+            # Optionally warm model depending on env
+            disable_warm = os.getenv("DISABLE_MODEL_WARMUP", "false").lower() == "true"
+            if not disable_warm:
+                get_model_and_transform()
             get_session_store()
         except Exception:
             # Avoid crashing startup on warm errors
diff --git a/navigator/data/plans/.keep b/navigator/data/plans/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/navigator/requirements.txt b/navigator/requirements.txt
index 139fc76..7a3a3c7 100644
--- a/navigator/requirements.txt
+++ b/navigator/requirements.txt
@@ -2,6 +2,7 @@
 fastapi==0.111.0
 uvicorn[standard]==0.30.1
 pydantic==2.7.4
+pydantic-settings>=2.2
 numpy>=1.24
 pillow>=10.0
 faiss-cpu>=1.8.0
diff --git a/navigator/runtime.txt b/navigator/runtime.txt
new file mode 100644
index 0000000..530fe91
--- /dev/null
+++ b/navigator/runtime.txt
@@ -0,0 +1 @@
+3.11.9
\ No newline at end of file
diff --git a/render.yaml b/render.yaml
index 8c82094..0cbcff6 100644
--- a/render.yaml
+++ b/render.yaml
@@ -1,14 +1,14 @@
 services:
   - type: web
     name: arch-circare-api
-    runtime: python
+    env: python
     rootDir: navigator
     buildCommand: pip install -r requirements.txt
     startCommand: uvicorn app.main:app --host 0.0.0.0 --port $PORT
     plan: starter
     envVars:
       - key: DATA_DIR
-        value: ../data
+        value: data
       - key: MAX_UPLOAD_MB
         value: "10"
       - key: ALLOW_PDF
@@ -17,10 +17,14 @@ services:
         value: "https://arch-circare-ui.onrender.com,http://localhost:5173"
       - key: UPLOAD_TMP_DIR
         value: /tmp
+      - key: PYTHON_VERSION
+        value: "3.11.9"
+      - key: DISABLE_MODEL_WARMUP
+        value: "true"
 
   - type: web
     name: arch-circare-ui
-    runtime: static
+    env: static
     rootDir: ui
     buildCommand: npm ci --no-audit --no-fund && npm run build
     staticPublishPath: dist
diff --git a/ui/src/components/FeedbackButtons.tsx b/ui/src/components/FeedbackButtons.tsx
index 113b208..702a856 100644
--- a/ui/src/components/FeedbackButtons.tsx
+++ b/ui/src/components/FeedbackButtons.tsx
@@ -1,5 +1,4 @@
-import React from 'react';
-
+// Feedback controls for each result card
 interface FeedbackButtonsProps {
   imageId: string;
   isLiked?: boolean;
diff --git a/ui/src/components/LatentMap.tsx b/ui/src/components/LatentMap.tsx
index eb180b8..c53f01e 100644
--- a/ui/src/components/LatentMap.tsx
+++ b/ui/src/components/LatentMap.tsx
@@ -188,7 +188,7 @@ export default function LatentMap({ onLensChange, selectedProjectId, lensImageId
 
     // Update hover tooltip
     const point = findPointAt(x, y, canvas);
-    setHoveredPoint(point);
+    setHoveredPoint(point ?? null);
     if (point) {
       setHoveredPosition({ x, y });
     } else {
diff --git a/ui/src/components/ResultsGrid.tsx b/ui/src/components/ResultsGrid.tsx
index 544af6f..f80d4bf 100644
--- a/ui/src/components/ResultsGrid.tsx
+++ b/ui/src/components/ResultsGrid.tsx
@@ -1,4 +1,5 @@
 import { API_BASE } from '../lib/api';
+// Note: queryId is intentionally not destructured from props to satisfy TS6133
 import FeedbackButtons from './FeedbackButtons';
 
 interface SearchResult {
@@ -117,7 +118,7 @@ function SpatialMetricsTooltip({ projectId, spatialDebug }: {
   );
 }
 
-export default function ResultsGrid({ results, isLoading, latency, debug, onOpenGallery, onFeedback, feedbackState, queryId }: ResultsGridProps) {
+export default function ResultsGrid({ results, isLoading, latency, debug, onOpenGallery, onFeedback, feedbackState }: ResultsGridProps) {
   if (isLoading) {
     return (
       <div style={{ marginTop: 24 }}>