Complete activity-core LLM endpoint handoff (LLM-WP-0006)

Switch the custodian triage default from anthropic/claude-sonnet-4 to
google/gemini-2.5-flash, which advertises structured-output support on
OpenRouter. Tighten the OpenRouter adapter to send strict JSON schema
requests and set provider.require_parameters=true so routing only hits
providers that honor the requested response_format.

Update Kubernetes deploy docs and config for the verified coulombcore
handoff: Containerfile build path, image-pull-policy=Never for smoke
pods, credential-routing notes, and live smoke evidence. Mark
LLM-WP-0006 finished with closure notes from 2026-06-18.

llm_connect/openrouter.py

@@ -82,6 +82,13 @@ class OpenRouterAdapter(LLMAdapter):
         }
         if config.model_params:
             merge_openai_chat_model_params(payload, config.model_params)
+            provider_params = config.model_params.get("provider")
+            if isinstance(provider_params, dict):
+                payload["provider"] = dict(provider_params)
+            if _uses_json_schema_response_format(payload):
+                provider = payload.setdefault("provider", {})
+                if isinstance(provider, dict):
+                    provider.setdefault("require_parameters", True)
 
         headers = {
             "Authorization": f"Bearer {self._api_key}",
@@ -149,3 +156,8 @@ class OpenRouterAdapter(LLMAdapter):
                 else:
                     raise
         raise last_exc  # type: ignore[misc]
+
+
+def _uses_json_schema_response_format(payload: Dict[str, Any]) -> bool:
+    response_format = payload.get("response_format")
+    return isinstance(response_format, dict) and response_format.get("type") == "json_schema"