chore(main): release 0.4.0

[haasonsaas]

🤖 I have created a release beep boop

0.4.0 (2026-05-08)

Features

• add agentd MCP work context (#124) (77ccd56)

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[cursor]

PR Summary

Low Risk
Low risk: only version/metadata updates (CHANGELOG.md, Info.plist, and version files) with no runtime logic changes.

Overview
Release 0.4.0 metadata update.

Updates the Release Please manifest, version.txt, and macOS support/Info.plist bundle versions to 0.4.0, and appends the 0.4.0 section to CHANGELOG.md.

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