docs: mark project as archived

[RareBird15]

Summary

Describe the change in a few sentences.

What Changed

• Describe the concrete code, docs, or workflow changes.

Why

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Validation

• uvx ruff check .
• uv run python -m unittest discover tests -v
• I tested the affected workflow manually, if applicable

Accessibility Review

• I considered how this change sounds in a screen reader, not just how it looks in a terminal
• I did not add decorative ASCII, visual-only cues, or formatting that makes output harder to read aloud
• Prompts, labels, and headings remain plain, predictable, and understandable

Content and Policy Review

• I did not commit copyrighted EPUBs or generated plan content without explicit rights
• I updated documentation if user-visible behavior changed
• I updated CHANGELOG.md if this change is user-visible

Notes for Reviewers

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[Copilot]

Pull request overview

Updates the project’s top-level documentation to reflect that the repository is now archived, while reflowing long README lines for readability and accessibility.

Changes:

• Marks the project as archived/no longer actively maintained in the README.
• Adds additional context explaining the project’s origin and why maintenance has stopped.
• Rewraps multiple README paragraphs and list items to a consistent line width.

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