fix: resolve broken links and workflow failures

[jeremyeder]

Summary

Fixes broken documentation links and GitHub Actions workflow failures.

Workflow Fixes

• continuous-learning.yml: Add uv venv setup before pip install, use HEREDOC for multi-line commit message
• update-docs.yml: Add missing step id create-issue to fix step output reference

Documentation Fixes

• Remove dead link to release-process-visualization.html (file doesn't exist)
• Update announcement banner to reference CLI Reference instead
• Replace "Release Pipeline" button with "Leaderboard" button in hero
• Fix CONTRIBUTING.md link in attributes.md (now points to GitHub URL)
• Fix LICENSE link in attributes.md (now points to GitHub URL)

Resolves

• https://github.com/ambient-code/agentready/actions/runs/19921570967
• https://github.com/ambient-code/agentready/actions/runs/19921570784
• Dead link: https://ambient-code.github.io/agentready/release-process-visualization.html

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