AS0711/a11y-seo-retrofitter

fix: make /reset body optional — validator sends POST with no body

docs: update baseline scores — all 3 tasks now succeed (Easy 6 steps, Medium 5 steps, Hard 11 steps)

fix: add label-for prompt rule so hard task reaches 100% success

fix: easy task now solvable — empty title element + insert_meta_tag title support + LLM prompt hint + action history context + 429 backoff + .gitignore

fix: remove KeyError on total_reward in summary table

deploy: HF Spaces Docker deployment — non-root user, healthcheck, correct ports and URLs

fix: correct stdout format, health endpoint, reset schema, env vars, README port

feat: Add A11y & SEO Web Retrofitter environment