chore(main): release 0.5.0

[sht-bot]

🤖 I have created a release beep boop

0.5.0 (2026-09-05)

Features

• errconnect: Add connect-go error code mapping (#25) (b17fb03)

Bug Fixes

• release-please: Match signoff identity to bot's actual GitHub name (#27) (a904509)

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This PR was generated with Release Please. See documentation.

[cursor]

PR Summary

Low Risk
Only the release manifest and changelog are updated; no runtime or library code changes in the diff.

Overview
Release Please bumps the tracked version from 0.4.0 to 0.5.0 in .github/.release-please-manifest.json and adds a 0.5.0 section to CHANGELOG.md.

The new changelog entry records what ships in this tag: errconnect connect-go error code mapping (#25), and a release-please fix aligning commit signoff identity with the bot’s GitHub name (#27). This PR does not change library code—only version and release notes.

^{Reviewed by Cursor Bugbot for commit f3cd77e. Bugbot is set up for automated code reviews on this repo. Configure here.}

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