chore(agents): bump built-in adapter ranges

[steipete]

Bumps built-in npm adapter ranges missed by the package dependency update:

• @zed-industries/codex-acp from ^0.11.1 to ^0.12.0 (latest published 2026-04-24)
• pi-acp from ^0.0.22 to ^0.0.26

@agentclientprotocol/claude-agent-acp and @agentclientprotocol/sdk were already current at 0.31.0 / 0.20.0.

Local proof:

• fnm exec --using=24.15.0 corepack pnpm@10.33.2 run build:test
• fnm exec --using=24.15.0 node --test dist-test/test/agent-registry.test.js
• fnm exec --using=24.15.0 corepack pnpm@10.33.2 run check (573 tests)

[cursor]

PR Summary

Low Risk
Low risk: only updates default npm package version ranges for built-in agent launches and adds a small test asserting the new ranges.

Overview
Updates the default built-in agent adapter package ranges so fresh launches use @zed-industries/codex-acp@^0.12.0 and pi-acp@^0.0.26.

Adds coverage in agent-registry tests to assert the registry commands and package specs reflect the bumped ranges, and documents the bump in CHANGELOG.md.

^{Reviewed by Cursor Bugbot for commit f99f28a. Bugbot is set up for automated code reviews on this repo. Configure here.}

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Append new Unreleased changelog item at section end

AGENTS.md requires new CHANGELOG.md entries under ## Unreleased to be appended to the end of the target section, but this bullet was inserted at the top of ### Changes. That violates the repo’s changelog ordering rule and will create unnecessary merge conflicts as additional entries are added.

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[chatgpt-codex-connector]

Remove adapter semver ranges from changelog prose

The repo policy in AGENTS.md says documentation must not include adapter package version specifiers/semver ranges, but this line adds explicit ranges for codex-acp and pi-acp. Keeping hardcoded adapter versions in docs is explicitly disallowed here and makes documentation drift more likely; this entry should describe the update without embedding ranges.

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