[BUG] Remote Control fails with "Failed to convert session context" for self-hosted git remotes

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Remote Control (/remote-control) fails with HTTP 400 "Failed to convert session context" when the repository has a
self-hosted git remote URL with a non-standard port (e.g. https://example.com:8443/org/repo.git).

Environment registration succeeds, but session creation fails immediately after.

What Should Happen?

Remote Control should work regardless of the git remote URL format (self-hosted, non-standard ports, etc.)

Error Messages/Logs

[bridge:api] POST /v1/environments/bridge -> 200 environment_id=env_...
  [bridge] Session creation failed with status 400: Failed to convert session context
  [bridge:repl] Session creation failed, deregistering environment

Steps to Reproduce

1. Open Claude Code in a git repository with a self-hosted remote:

git remote set-url origin https://example.com:8443/org/repo.git

1. Run /remote-control
2. Session creation fails with status 400

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.74

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

• Works fine in non-git directories
• Works fine in git repos without a remote, or with standard GitHub remotes
• Tested: removing CLAUDE.md does NOT fix it, only removing the git remote fixes it
• Debug log attached (ran with claude --debug)