From d6ad4d89f93e39025d5eaec817f9420c8217cc46 Mon Sep 17 00:00:00 2001
From: User <onyx@local>
Date: Tue, 14 Oct 2025 22:43:04 -0400
Subject: [PATCH] Implement authentication for push and sync
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Add comprehensive authentication support to enable onx push and onx sync
to work with remote repositories.

New Features:
- Created internal/git/auth.go with multi-method authentication
  * SSH: ssh-agent and ~/.ssh key file support
  * HTTPS: git credential helper, environment variables
  * Auto-detection based on remote URL
  * Credential caching for performance

- Updated internal/commands/push.go
  * Integrate AuthProvider for remote authentication
  * Graceful fallback if auth unavailable

- Updated internal/commands/sync.go
  * Integrate AuthProvider for fetch operations
  * Consistent auth handling with push

Benefits:
✅ onx push now works with authenticated remotes
✅ onx sync can fetch from private repositories
✅ Leverages existing git credential helpers
✅ Zero-configuration for standard setups
✅ SSH and HTTPS support

Successfully tested: pushed 4 branches to origin using onx push!