radiance exports vllm:* metrics (verified on the live endpoint), not
llamacpp:*: nothing in llm-fleet could ever see frank-archon. Add a
vllm-fleet group - 1 recording + 4 alert (queueing, prefix-cache
collapse, preemption, p95 time-to-first-token) keyed to vllm:*.
Split the observability seam so llm-fleet rules bind llamacpp:* and
vllm-fleet rules bind vllm:*, and neither may evaluate the other's
namespace. Drops the retired no-metrics-for-archon doctrine the seam
still asserted and the vacuous namespace grep.
Frank
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