Prepare README for international critical testing

[icerain-cmd]

What changed

• adds a prominent international call for 10 critical humanities testers to the English and Korean READMEs
• places the positioning line Use AI without surrendering scholarly judgment at the top of the project
• links directly to the live documentation and GitHub Discussions
• adds structured issue forms for a test report, methodological criticism, and installation problems
• regenerates MANIFEST.json for the final branch tree

Why

The repository already explains the framework and its limits well, but international humanities researchers need a clear, low-friction way to participate as reviewers rather than being treated as prospective users or recipients of a promotional announcement.

Research and privacy safeguards

The new forms explicitly prohibit unpublished manuscripts, personal data, reviewer identities, secrets, private paths, and copyrighted source text. They request anonymized descriptions and minimal excerpts.

Validation

A one-time branch workflow removed itself after regenerating the manifest and ran:

• python3 scripts/validate_repository.py
• python3 scripts/run_integrated_tests.py
• python3 scripts/validate_public_release.py
• mkdocs build --strict

The temporary synchronization workflow is not part of the final diff.