Fix git authentication issues for remote branch creation and push

[roomote]

Problem

Users were experiencing 'Permission denied (publickey)' errors when trying to create and push remote git branches.

Root Causes Identified

1. Missing HOME Environment Variable: The $HOME environment variable was not set, causing git to fail when accessing global configuration files.
2. No Git Credential Helper: Git was not configured with a credential helper to manage authentication for HTTPS operations.
3. Missing Git Credentials: Although the GH_TOKEN environment variable was available, git was not configured to use it for authentication.

Solution

• Created scripts/setup-git-auth.sh to automate git authentication setup
• Added comprehensive documentation in docs/git-authentication-fix.md
• Fixed missing HOME environment variable and credential helper configuration
• Enabled HTTPS authentication for git operations using GitHub tokens

Testing

• ✅ Successfully tested branch creation and push operations
• ✅ All linting and type checking passes
• ✅ Git authentication now works properly for HTTPS operations

Usage

Run ./scripts/setup-git-auth.sh to fix git authentication issues.

Resolves issues with 'Permission denied (publickey)' and 'could not read Username' errors when creating and pushing remote branches.

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Important

Fixes git authentication issues by automating environment and configuration setup for HTTPS using a new script and documentation.

• Behavior:
  • Adds scripts/setup-git-auth.sh to automate git authentication setup, setting $HOME, configuring credential helper, and using GH_TOKEN for HTTPS.
  • Fixes 'Permission denied (publickey)' and 'could not read Username' errors by ensuring proper environment and git configuration.
• Documentation:
  • Adds docs/git-authentication-fix.md detailing problem, solution, and usage of the setup script.
• Testing:
  • Successfully tested branch creation and push operations post-fix.
  • All linting and type checking passes.

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[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to e559ef3.

Security Overview

• 🔎 Scanned files: 2 changed file(s)

Detected Code Changes

Change Type	Relevant files
Documentation	► docs/git-authentication-fix.md     Document git authentication issues and solutions
Enhancement	► scripts/setup-git-auth.sh     Add setup script for git authentication configuration

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