[cyfyifanchen]

Summary

Replace the previous EverMind community invitation with https://discord.gg/QHQ2YYp7cH.

Verification

• git diff --check origin/v1..HEAD passed.
• Searched tracked files for both previous invite codes (gYep5nQRZJ, geHdX4F24B): no remaining matches.
• Verified the new invite through the Discord API: guild EverMind, expires_at: null.
• Checked that every changed file differs only by the invite-code replacement.

Documentation-only change; no runtime tests needed.

[gloryfromca]

No blockers; this can merge as far as I am concerned.

The new invite resolves through Discord's API to the EverMind guild and reports no expiration. I covered the full diff, surrounding README and all repository Discord references, relevant history, backward compatibility, test weakening, and architecture impact; the latter three have no runtime relevance because this changes only the documented URL. No AGENTS.md, CLAUDE.md, or CONTEXT*.md guidance files are present.

Verification: git diff --check origin/v1...HEAD passed; after installing the repository-declared dependencies, python -m pytest passed (239 tests). The initial collection attempt failed only because python-dateutil was absent from the environment.