Add Dreaming competitor retest closeout

[yvette-carlisle]

Summary

• add the XY-955 Dreaming competitor-strength retest report and machine-readable closeout
• update the Dreaming readiness ledger, benchmarking index, and README with bounded claims
• add report-shape tests that reject broad superiority overclaims and preserve follow-up boundaries

Verification

• cargo make fmt-check
• cargo test -p elf-eval --test real_world_job_benchmark dreaming_competitor_strength_retest_report_closes_xy955_without_overclaims -- --test-threads=1
• cargo make real-world-memory
• cargo make real-world-memory-graph-rag
• cargo make real-world-first-generation-oss
• cargo make real-world-memory-live-adapters

Notes

Decodex generated the patch but stopped in repo gate after repeated Linear GraphQL timeouts; this PR is the manual takeover for XY-955.