feat: add sync_local_repository tool for syncing local directories to GitHub

[Calvin-Francis]

Summary

This PR adds a new sync_local_repository tool that enables MCP clients to sync local directories directly to GitHub repositories without requiring the git CLI.

Motivation

Currently, MCP clients can push individual files via push_files, but there's no convenient way to sync an entire local directory. This is particularly useful for AI assistants that need to help users:

• Initialize new projects on GitHub
• Push local codebases without git setup
• Sync workspace changes in a single operation

Changes

New Tool: sync_local_repository

Parameter	Type	Required	Description
local_path	string	✅	Absolute path to the local directory
owner	string	✅	Repository owner
repo	string	✅	Repository name
message	string	✅	Commit message
branch	string	❌	Branch to push to (default: main)
create_repo	boolean	❌	Auto-create repository if missing
private	boolean	❌	Make new repo private (default: true)
max_files	number	❌	Max files to sync (default: 100, max: 500)

Features:

• Respects .gitignore patterns
• Skips binary files automatically
• Can optionally create the repository if it doesn't exist
• Single atomic commit for all files

Files Changed

• pkg/github/local_sync.go - New tool implementation
• pkg/github/tools.go - Register tool in repos toolset

Testing

Tested locally with Windsurf MCP client:

• ✅ Successfully synced 246 files to a new repository
• ✅ Correctly skipped binary files and ignored patterns
• ✅ Auto-created repository when create_repo=true

Limitations

• Maximum 500 files per sync (GitHub API constraint)
• Binary files are skipped (text files only)
• Simplified gitignore matching (no negation patterns)