SE attribution audit dsp: replace ~30% banner with audited numbers

SE attribution audit dsp: per-sample metadata.stack_exchange_attribution + attribution_recovery markers

fix: align org refs to ailiance brand

fix: dataset path electron-rare to Ailiance-fr

docs: link to ailiance-bench v0.2 scoreboard

chore: rebrand card to Ailiance

docs(README): EU AI Act source disclosure + legal-audit attribution remediation (2026-05-11)

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initial commit