Scaffold ProSe Clean Hub Structure

[google-labs-jules]

This PR establishes the ProSe repository as the "Clean Hub" (Cathedral) by implementing the required governance documentation, directory structure, and GitHub identity files. It also includes the repository inventory report based on the state of commit 6977b55, which serves as the foundation for the code included in this scaffold.

Changes:

• Created docs/REPOSITORY_INVENTORY.md detailing the file tree and gap analysis of commit 6977b55.
• Added .github/ISSUE_TEMPLATE/ for Bug Reports, Feature Requests, and Cleanup Requests.
• Added .github/PULL_REQUEST_TEMPLATE.md with a cleanliness checklist.
• Added .github/workflows/repo_clean.yml to enforce repository hygiene.
• Overwrote README.md with the official project philosophy and structure.
• Added CONTRIBUTING.md and CODE_OF_CONDUCT.md to define contribution standards.
• Added LICENSE (MIT) and initialized CHANGELOG.md.
• Created core directories: scripts, file_organizer, examples, case/DivorceFiles.
• Preserved engine/agents/evidence_validator.py and related tests/schemas from the base commit.

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PR created automatically by Jules for task 7600464388160049347 started by @cyserman

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