Simplify results and installation

[maveryn]

Summary

• restore the Hugging Face Collection hero link in place of the redundant Results/Reproduce badge
• make external benchmark transfer the single results section on the README and project page
• reduce TRACE in-distribution validation to one concise paragraph below the transfer summary
• keep the 24-benchmark table collapsed and retain the full comparison link
• shorten README installation to the standard clone/install block and move reproducibility, export, virtual-environment, and Python 3.14 details into Quickstart
• extend visibility tests to preserve the simplified presentation

Why

External transfer is the central result, while the separate in-distribution heading and table repeated nearby evidence. The detailed installation variants are valuable reference material but interrupt the README’s main path.

Validation

• python -m pytest -q tests/test_visibility_surfaces.py tests/test_docs_site.py tests/test_public_paper.py — 27 passed
• mkdocs build --strict --site-dir site — passed
• documentation/repository hygiene scan — passed
• generated homepage confirms the Collection button, single transfer heading, brief TRACE validation summary, and collapsed benchmark table