chore(main): release 0.5.0

[sht-bot]

🤖 I have created a release beep boop

0.5.0 (2026-10-07)

Features

• errconnect: Add connect-go error code mapping (#25) (b17fb03)
• error: Expose causes to errors.Is and errors.As (#31) (a3b0bf6)

Bug Fixes

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

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[cursor]

PR Summary

Low Risk
Only version manifest and changelog updates; no runtime code changes in this diff.

Overview
Release 0.5.0 — bumps the Release Please manifest from 0.4.0 to 0.5.0 and adds the corresponding CHANGELOG section for 2026-10-07.

This PR does not change library code; it packages already-merged work for the tag: connect-go error code mapping (errconnect), cause-chain visibility for errors.Is / errors.As, and a release-please signoff identity fix.

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