* test(e2e): cover Langfuse logging.yaml P0 logs_spend cells
Team, user/key, and org-scoped dynamic Langfuse callbacks drive real chat
traffic and assert calculatedTotalCost matches StandardLogging response_cost
and proxy spend. Also assert tool calls and applied guardrails land on the
trace. Missing env or proxy is a hard failure, never a skip
* test(e2e): use langfuse_otel callback for Langfuse spend coverage
Team and key dynamic logging attach callback_name=langfuse_otel (OTLP to
Langfuse) instead of the classic langfuse SDK. Match generations named
litellm_request by prompt marker and user_api_key_alias
* test(e2e): require Langfuse spend assert; drop AGENTS.md
Guardrail path no longer soft-gates logs_spend. Non-stream responses must
return positive x-litellm-response-cost; remove tests/e2e/AGENTS.md
* test(e2e): fail when Langfuse spend is missing on guardrail path
Always run logs_spend assertions for tool_permission; require positive
x-litellm-response-cost on non-stream and positive /spend/logs spend
* test(e2e): do not fall back to unmatched spend log rows
poll_proxy_spend_for_key returns None when response_id or positive-spend
filters match nothing, instead of silently using rows[0]
