Reorganize lab structure and add evaluation/observability notebooks

- Reorganize 1-Begin-Here labs into structured subdirectories
- Add new evaluation notebooks (quality, safety, agents)
- Add agent exploration labs (service & framework)
- Update requirements.txt with tracing dependencies
- Add comprehensive .env.sample template
- Update .gitignore to exclude tmp/, *.old/, backup folders

Author: nitya

.gitignore

@@ -15,6 +15,14 @@
 
 # ForBeginners folder
 scripts/ForBeginners/
+scripts/ForBeginners.old/
+
+# Temporary and backup folders
+tmp/
+*.old/
+*.orig/
+**/.old/
+**/.orig/
 
 # User-specific files (MonoDevelop/Xamarin Studio)
 *.userprefs
@@ -428,3 +436,6 @@ site/*
 # .github
 .venv
 .github/chatmodes/
+
+# Ignore tmp/ workspaces
+tmp/

…-Begin-Here/01-create-search-index.ipynb …ere/1-setup/01-create-search-index.ipynblab/1-Begin-Here/01-create-search-index.ipynb renamed to lab/1-Begin-Here/1-setup/01-create-search-index.ipynb lab/1-Begin-Here/01-create-search-index.ipynb renamed to lab/1-Begin-Here/1-setup/01-create-search-index.ipynb

@@ -42,20 +42,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "True"
-      ]
-     },
-     "execution_count": 1,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
     "import os\n",
     "import pandas as pd\n",
@@ -112,7 +101,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -148,7 +137,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -269,7 +258,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -370,21 +359,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "deleting index zava-products\n",
-      "Creating index zava-products\n",
-      "Creating index zava-products\n",
-      "Index zava-products created successfully\n",
-      "Index zava-products created successfully\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "# Configure Azure AI Search service connection\n",
     "zava_search = os.environ[\"AZURE_AISEARCH_ENDPOINT\"]\n",
@@ -438,18 +415,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Processing Zava product catalog and generating embeddings...\n",
-      "Processing first 51 products from catalog\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "# Process Zava product catalog and generate embeddings\n",
     "print(f\"Processing Zava product catalog and generating embeddings...\")\n",
@@ -469,21 +437,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Uploading 51 Zava products to index zava-products\n",
-      "Successfully uploaded 51 products to the search index!\n",
-      "The Zava product catalog is now ready for semantic search.\n",
-      "Successfully uploaded 51 products to the search index!\n",
-      "The Zava product catalog is now ready for semantic search.\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "\n",
     "# Upload all product documents to the index\n",