docs: position Raven as the Harness of Harnesses

[cyfyifanchen]

Summary

• Position Raven as both the runnable open-source harness and the broader research and ecosystem direction.
• Define Raven as The Harness of Harnesses and explain the All-Domain Collaboration Network.
• Highlight Trusted, Persistent, and Evolving behavior plus the evaluation, execution, verification, memory, and feedback loop in English and Chinese.
• Surface the 22-task evaluation and quality-cost Pareto-frontier positioning before the published benchmark table.
• Replace the old banner with a 129 KB GitHub-hosted Raven visual.

Type

• Fix
• Feature
• Docs
• CI / tooling
• Refactor
• Other

Verification

• .venv/bin/pre-commit run --files README.md README.zh-CN.md - passed

• env UV_CACHE_DIR=/private/tmp/raven-uv-cache make check-large-files - passed

• git diff --check origin/main...HEAD - passed

• git merge-tree --write-tree HEAD origin/main - clean

• No runtime tests were run because this change only updates documentation and externally hosted artwork.

• Relevant tests pass locally

• Relevant lint / type checks pass locally

• User-facing docs or screenshots are updated when needed

Risk

• Security impact considered
• Backward compatibility considered
• Rollback path is clear for risky changes

The change affects repository messaging only. Rollback is a revert of the documentation commit and restoration of the previous banner URL.

Related Issues

N/A

[cyfyifanchen]

[cyfyifanchen]

Superseded by the current Raven banner.

[cyfyifanchen]