Try multiple API key secret names for compatibility

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -549,10 +549,18 @@ STAGE_FOCUS = {
 # ============ CLAUDE INTEGRATION ============
 
 def get_client():
-    """Initialize Anthropic client"""
-    api_key = os.environ.get("anthropic_key")
+    """Initialize Anthropic client - try multiple possible secret names"""
+    api_key = (
+        os.environ.get("anthropic_key") or
+        os.environ.get("ANTHROPIC_KEY") or
+        os.environ.get("ANTHROPIC_API_KEY") or
+        os.environ.get("anthropic_api_key")
+    )
     if not api_key:
-        raise ValueError("anthropic_key environment variable not set. Add it in Space Settings > Repository secrets.")
+        raise ValueError(
+            "Anthropic API key not found. Please add a secret in Space Settings > Repository secrets. "
+            "Try naming it: ANTHROPIC_API_KEY"
+        )
     return anthropic.Anthropic(api_key=api_key)
 
 def call_claude(system_prompt, messages, context=""):