Publish competitor-strength adoption report

[yvette-carlisle]

Summary

• Publish the final XY-901 competitor-strength adoption report as durable Markdown.
• Commit the machine-readable adoption report JSON produced by the interrupted worker.
• Link the final report from the benchmarking guide index.

Validation

• jq report schema/count sanity check
• cargo make fmt
• cargo make lint-fix
• cargo make checks

Decodex recovery

Manual recovery for XY-901 after the retained run exited without terminal status; no runtime DB rows were edited.