Blocker: The Stage-1 Output Contains No Analyzable Content

The analysis of the provided article shows that in the Stage-1 output every substantive field is empty: no article title, no source, unclassified type, empty one-sentence summary, no author stance, no article purpose, and an empty information points list. The only non-empty datum is the domain label, tennis. A single signal is not enough to ground a deep analysis; core-viewpoint extraction, argument-structure mapping, evidence-quality assessment, and time-sensitivity analysis cannot be produced from a domain tag alone. Anything written would be invention about a hypothetical tennis article and would not be traceable to the source. Note also that source quality and time sensitivity were explicitly deferred in Stage 1, but since the information points list is empty there are no source fields to judge from, so the deferral cannot be resolved downstream. This is a Stage-1 failure, not a Stage-2 problem. Likely causes include upstream extraction returning nothing, the article being passed as an empty string, or a parsing or schema mismatch dropping fields. Fixing the analysis prompt will not help; the input pipeline needs checking. The minimum input to proceed is any one of the following: the raw article text, a re-run Stage-1 output with information points populated, or, if the source is inaccessible, the title, outlet, publication date, and author. The empty fields will not be filled with plausible-sounding tennis content, because that would silently corrupt every downstream stage that trusts this output.