Add OpenRouter backup key failover

src/humeo/content_pruning.py

@@ -49,11 +49,11 @@ from humeo.env import (
     OPENROUTER_BASE_URL,
     current_llm_provider,
     model_name_for_provider,
-    openrouter_default_headers,
-    resolve_gemini_api_key,
-    resolve_llm_provider,
-    resolve_openrouter_api_key,
-)
+    openrouter_default_headers,
+    resolve_gemini_api_key,
+    resolve_llm_provider,
+    resolve_openrouter_api_keys,
+)
 from humeo.gemini_generate import gemini_generate_config
 from humeo.prompt_loader import content_pruning_system_prompt
 
@@ -1009,24 +1009,41 @@ def request_prune_decisions(
                 raise RuntimeError("Gemini returned empty response text for content pruning")
             return response.text
 
-        client = OpenAI(
-            api_key=resolve_openrouter_api_key(),
-            base_url=OPENROUTER_BASE_URL,
-            default_headers=openrouter_default_headers(),
-        )
-        response = client.chat.completions.create(
-            model=model_name,
-            messages=[
-                {"role": "system", "content": system},
-                {"role": "user", "content": user_text},
-            ],
-            temperature=0.2,
-            response_format={"type": "json_object"},
-        )
-        text = _openai_message_text(response.choices[0].message.content)
-        if not text:
-            raise RuntimeError("OpenRouter returned empty response text for content pruning")
-        return text
+        keys = resolve_openrouter_api_keys()
+        last_error: Exception | None = None
+        for key_idx, api_key in enumerate(keys, start=1):
+            try:
+                client = OpenAI(
+                    api_key=api_key,
+                    base_url=OPENROUTER_BASE_URL,
+                    default_headers=openrouter_default_headers(),
+                )
+                response = client.chat.completions.create(
+                    model=model_name,
+                    messages=[
+                        {"role": "system", "content": system},
+                        {"role": "user", "content": user_text},
+                    ],
+                    temperature=0.2,
+                    response_format={"type": "json_object"},
+                )
+                text = _openai_message_text(response.choices[0].message.content)
+                if not text:
+                    raise RuntimeError("OpenRouter returned empty response text for content pruning")
+                if key_idx > 1:
+                    logger.info("OpenRouter content pruning succeeded with fallback key %d/%d", key_idx, len(keys))
+                return text
+            except Exception as exc:
+                last_error = exc
+                if key_idx < len(keys):
+                    logger.warning(
+                        "OpenRouter content pruning failed with key %d/%d: %s; trying fallback",
+                        key_idx,
+                        len(keys),
+                        exc,
+                    )
+        assert last_error is not None
+        raise last_error
 
     raw = _retry_llm("Gemini content pruning", _call)
     decisions = _parse_decisions(raw)