cleanup: consolidate all repo operations into Repository methods

[unknwon]

Summary

This is a breaking change for v2 that consolidates the API by removing all redundant top-level functions that accept repoPath as the first parameter. These functions have been moved directly into Repository methods.

Problem

The previous API had a confusing mix of:

1. Top-level functions: Push(repoPath, remote, branch)
2. Repository methods: repo.Push(remote, branch)
3. Deprecated wrappers: RepoPush(repoPath, remote, branch)

This tripled the API surface without adding value.

Solution

Removed 28 top-level functions - use Repository methods instead:

Removed Function	Use Instead
Push(repoPath, ...)	repo.Push(...)
Checkout(repoPath, ...)	repo.Checkout(...)
Reset(repoPath, ...)	repo.Reset(...)
Move(repoPath, ...)	repo.Move(...)
Add(repoPath, ...)	repo.Add(...)
CreateCommit(repoPath, ...)	repo.Commit(...)
ShowNameStatus(repoPath, ...)	repo.ShowNameStatus(...)
CountObjects(repoPath, ...)	repo.CountObjects(...)
Fsck(repoPath, ...)	repo.Fsck(...)
Log(repoPath, ...)	repo.Log(...)
DiffNameOnly(repoPath, ...)	repo.DiffNameOnly(...)
MergeBase(repoPath, ...)	repo.MergeBase(...)
ShowRefVerify(repoPath, ...)	repo.ShowRefVerify(...)
SymbolicRef(repoPath, ...)	repo.SymbolicRef(...)
DeleteBranch(repoPath, ...)	repo.DeleteBranch(...)
HasReference(repoPath, ...)	repo.HasReference(...)
HasBranch(repoPath, ...)	repo.HasBranch(...)
HasTag(repoPath, ...)	repo.HasTag(...)
RemoteAdd(repoPath, ...)	repo.RemoteAdd(...)
RemoteRemove(repoPath, ...)	repo.RemoteRemove(...)
Remotes(repoPath, ...)	repo.Remotes(...)
RemoteGetURL(repoPath, ...)	repo.RemoteGetURL(...)
RemoteSetURL(repoPath, ...)	repo.RemoteSetURL(...)
RemoteSetURLAdd(repoPath, ...)	repo.RemoteSetURLAdd(...)
RemoteSetURLDelete(repoPath, ...)	repo.RemoteSetURLDelete(...)
Tags(repoPath, ...)	repo.Tags(...)

Kept top-level functions (no repo required):

• Init(path, ...) - creates new repo
• Clone(url, dst, ...) - clones repo
• Open(repoPath) - opens repo

Migration Guide

// Before
err := git.Push(repoPath, "origin", "main")
commits, err := git.Log(repoPath, "HEAD")

// After
repo, err := git.Open(repoPath)
if err != nil {
    return err
}
err := repo.Push("origin", "main")
commits, err := repo.Log("HEAD")

Stats

• 345 deletions, 83 insertions
• -262 net lines of code
• 28 redundant functions removed
• Tests updated and passing
• CI updated to Go 1.26.x and v2 branch

Breaking Changes

This is a v2 breaking change. Any code using the removed top-level functions will need to be updated to use Repository methods.