test(e2e): fix llm key skip guard

robot/e2e/common_e2e.resource

@@ -69,8 +69,7 @@ Skip If No LLM Keys
     ${openai_valid}=    Run Keyword And Return Status    Should Match Regexp    ${openai_key}    ^(sk|rk)-[A-Za-z0-9_-]+(\.[A-Za-z0-9_-]+)?$
     ${anthropic_valid}=    Run Keyword And Return Status    Should Match Regexp    ${anthropic_key}    ^sk-(ant|live)-[A-Za-z0-9_-]+$
     Set Log Level    ${prev_level}
-    ${has_keys}=    Set Variable    ${openai_valid}
-    Run Keyword If    not ${has_keys}    ${has_keys}=    Set Variable    ${anthropic_valid}
+    ${has_keys}=    Evaluate    bool($openai_valid) or bool($anthropic_valid)
     Run Keyword If    not ${has_keys}    Skip    No usable LLM API keys available (ANTHROPIC_API_KEY / OPENAI_API_KEY). Skipping E2E test.
 
 Resolve LLM Actor
@@ -89,7 +88,7 @@ Resolve LLM Actor
     ...                  anthropic_model — actor name returned when the probe fails or
     ...                                   the key is absent
     ...                                   (default: anthropic/claude-sonnet-4-20250514).
-    [Arguments]    ${openai_model}=openai/gpt-4o    ${anthropic_model}=anthropic/claude-sonnet-4-20250514
+    [Arguments]    ${openai_model}=openai/gpt-4o    ${anthropic_model}=anthropic/claude-sonnet-4-6
     # Short-circuit: if the key is not present at all, skip the network probe.
     ${has_openai}=    Evaluate    bool(__import__('os').environ.get('OPENAI_API_KEY', ''))
     IF    not ${has_openai}