Add promptgenai plugin for AI-based command assistance

plugins/promptgenai/promptgenai.plugin.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+
+pgi() {
+  if [[ -z "$AI_PROMPTGEN_API_KEY" ]]; then
+    echo "❌ API key not set. Please export AI_PROMPTGEN_API_KEY in your .bashrc"
+    return 1
+  fi
+
+  if [[ -z "$1" ]]; then
+    echo "Usage: pgi \"your command-related question\""
+    return 1
+  fi
+
+  local query="$1"
+
+  local response=$(curl -s https://openrouter.ai/api/v1/chat/completions \
+    -H "Authorization: Bearer $AI_PROMPTGEN_API_KEY" \
+    -H "Content-Type: application/json" \
+    -d '{
+      "model": "mistralai/mixtral-8x7b-instruct",
+      "messages": [
+        {
+          "role": "system",
+          "content": "You are a bash expert. Reply with commands and explanations. Provide only relevant and copyable command blocks where applicable."
+        },
+        {
+          "role": "user",
+          "content": "'"${query//\"/\\\"}"'"
+        }
+      ]
+    }')
+
+  if echo "$response" | jq -e '.choices[0].message.content' > /dev/null; then
+    echo "$response" | jq -r '.choices[0].message.content'
+  else
+    echo "⚠️ Something went wrong."
+    echo "Raw response:"
+    echo "$response"
+  fi
+}
+