[yodablocks]

Docs only. The top-level README did not mention experiments/ at all, although #28, #30 and #31 added three experiments with their own READMEs.

• New Experiments section between Status and limitations and Development: one table row per experiment (question and headline result), linking to each experiment's README.
• experiments/ added to the layout block.
• A short caveat paragraph: small gold set, 28 of 38 questions drafted from the searched chunks, LLM-drafted hard questions not reviewed by a person, saturation on an iterated set.
• The Retrieval quality section and the Status and limitations bullets are untouched: they describe the shipped defaults, and none of the experiments changes a default.

The numbers in the table were checked against experiments/*/results/*.json (33/38 and 38 at Hit@5 for bge on the union pool; 36, 35 and 38 pool recall at N=10 for embedding, RRF and union; 38/38 for union + Jev), and the three links resolve.