docs: add changelog entry for version 1.0.5

[sirawats]

Summary

Describe the problem and user-visible result.

Verification

• npm run verify
• Relevant focused tests
• Manual CLI or browser check, when applicable

List commands and results:

Review checklist

• The change is focused and contains no generated output.
• Tests cover changed behavior.
• README and CLI help remain consistent.
• CHANGELOG includes a user-visible entry when needed.
• OpenSpec requirements are updated when public behavior changes.
• Output safety and compatibility implications were considered.
• No credentials, private data, or unrelated files are included.