Surface wrong-cluster clone errors clearly in git-remote-entire

[toothbrush]

https://entire.io/gh/entireio/cli/trails/701

What

Cloning a repo whose audience host doesn't match where the repo actually lives produced an opaque error:

fatal: stateless-connect v2 info/refs: fetching info/refs from entry domain: repo-scoped token exchange: oauth token exchange: HTTP 400: {"error":"invalid_target","error_description":"audience host \"aws-us-east-2.entire.io\" does not host this repo; it lives on \"aws-eu-central-1.entire.io\" — re-target the request there"}

Now it prints:

fatal: this repository is not hosted on aws-us-east-2.entire.io; it lives on aws-eu-central-1.entire.io.
Re-run against the correct host, e.g.:

    git clone entire://aws-eu-central-1.entire.io/et/paul/dogbark

How

• httputil.OAuthError now captures the error_description field.
• git-remote-entire errors.As-digs the buried OAuthError, and for invalid_target whose description names the hosting cluster ("… lives on """) renders an actionable message with the corrected entire:// URL. Other errors fall back verbatim.

🤖 Generated with Claude Code

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Note

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[Copilot]

Pull request overview

This PR improves the UX of git-remote-entire when a clone/fetch fails due to targeting the wrong Entire cluster host by extracting the server-provided error_description (RFC 6749) and rendering an actionable “re-run against the correct host” message (including a corrected entire:// clone URL).

Changes:

• Extend httputil.OAuthError to capture error_description from OAuth token exchange failures.
• Add git-remote-entire error unwrapping to detect invalid_target wrong-cluster failures and print a clearer, copy/paste-friendly remediation message.
• Add unit tests in cmd/git-remote-entire for the new fatal error rendering behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
internal/entireclient/httputil/oauth.go	Captures OAuth error_description into OAuthError for downstream UX decisions.
cmd/git-remote-entire/main.go	Adds specialized fatal error formatting for wrong-cluster invalid_target failures.
cmd/git-remote-entire/main_test.go	Adds coverage for the new fatal message formatting logic.

[toothbrush]

I should note that this implementation is pretty ugly (trying to read the error string) - our backend doesn't at the moment make it super easy to raise anything other than a string error message. That's something we should improve.