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Replace cryptic AssertionErrors with informative RuntimeErrors that: - Explain what DCP (Decode Context Parallel) and PCP (Prefill Context Parallel) are - List compatible attention backends - Provide environment variable instructions (VLLM_ATTENTION_BACKEND) - Include documentation links Fixes #28407 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: yurekami <249254018+yurekami@users.noreply.github.com>