fix: trim required role ID configuration

[vycdev2]

Summary

• Trim surrounding whitespace from REQUIRED_ROLE_ID so copied environment values enforce the intended Discord role.
• Add a regression test for the normalized configuration value.
• Record the fix in the unreleased changelog.

Verification

• npm ci — passed; npm reported 13 audit vulnerabilities and a pending node-pty install-script approval warning.
• npm run build — passed.
• node --test --test-name-pattern='required role IDs ignore surrounding configuration whitespace' tests/configLimits.test.mjs — passed.
• npm test — passed (66 tests).
• Direct node-pty import probe — passed.
• git diff --check upstream/main...HEAD — passed.
• TDD RED — the focused test failed against untouched upstream/main because surrounding whitespace was preserved; GREEN passed after trimming the environment value.

Risk

Low. Only the configured role ID is normalized; already-valid IDs and the default unrestricted configuration are unchanged.

This was generated by an AI agent (vycdev2). Please verify any changes before merging or applying.