Adds initial gitlocal CLI and core functionality

Introduces the `gitlocal` command-line tool for managing nested Git repositories.

Includes the following main commands:
- `convert`: Renames `.git` to `.gitlocal`, allowing a parent repository to ignore the converted child repository. Supports recursive scanning and dry-run options. Tracks converted repositories in a global configuration.
- `revert`: Restores `.gitlocal` to `.git`. Includes an option to revert all tracked repositories.
- `status`: Displays a list of all repositories currently tracked by `gitlocal`, showing their path, conversion time, and original remote/branch.

Establishes internal modules for Git operations, configuration management, and recursive repository scanning.
Adds a comprehensive test suite covering core command logic and utility functions.
Initializes Go module and basic project `.gitignore`.

cmd/revert.go

@@ -0,0 +1,129 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"git.membo.co.uk/dtomlinson/gitlocal/internal/config"
+	"git.membo.co.uk/dtomlinson/gitlocal/internal/git"
+	"github.com/spf13/cobra"
+)
+
+var revertAll bool
+
+var revertCmd = &cobra.Command{
+	Use:   "revert [path]",
+	Short: "Revert .gitlocal back to .git",
+	Long: `Revert renames .gitlocal back to .git in the specified directory.
+If no path is provided, uses the current directory.
+
+Use --all to revert all tracked repositories from the config.`,
+	Args: cobra.MaximumNArgs(1),
+	RunE: runRevert,
+}
+
+func init() {
+	revertCmd.Flags().BoolVarP(&revertAll, "all", "a", false, "Revert all tracked repositories")
+}
+
+func runRevert(cmd *cobra.Command, args []string) error {
+	cfg, err := config.Load()
+	if err != nil {
+		return fmt.Errorf("failed to load config: %w", err)
+	}
+
+	if revertAll {
+		return revertAllRepos(cfg)
+	}
+
+	// Determine target path
+	targetPath := "."
+	if len(args) > 0 {
+		targetPath = args[0]
+	}
+
+	// Get absolute path
+	absPath, err := filepath.Abs(targetPath)
+	if err != nil {
+		return fmt.Errorf("failed to get absolute path: %w", err)
+	}
+
+	return revertSingle(absPath, cfg)
+}
+
+func revertSingle(path string, cfg *config.Config) error {
+	if !git.IsGitLocalRepo(path) {
+		return fmt.Errorf("no .gitlocal directory found at %s", path)
+	}
+
+	if git.IsGitRepo(path) {
+		return fmt.Errorf(".git already exists at %s", path)
+	}
+
+	// Revert
+	if err := git.Revert(path); err != nil {
+		return err
+	}
+
+	// Remove from config
+	cfg.RemoveRepo(path)
+	if err := cfg.Save(); err != nil {
+		return fmt.Errorf("failed to save config: %w", err)
+	}
+
+	fmt.Printf("✓ Reverted: %s\n", path)
+	return nil
+}
+
+func revertAllRepos(cfg *config.Config) error {
+	if len(cfg.Repos) == 0 {
+		fmt.Println("No repositories to revert")
+		return nil
+	}
+
+	fmt.Printf("Reverting %d repositories\n\n", len(cfg.Repos))
+
+	reverted := 0
+	failed := 0
+
+	// Create a copy of repos to iterate over, since we'll be modifying the config
+	repos := make([]config.Repo, len(cfg.Repos))
+	copy(repos, cfg.Repos)
+
+	for _, repo := range repos {
+		if !git.IsGitLocalRepo(repo.Path) {
+			fmt.Fprintf(os.Stderr, "⊘ Skipped (no .gitlocal found): %s\n", repo.Path)
+			// Remove from config even if .gitlocal doesn't exist
+			cfg.RemoveRepo(repo.Path)
+			continue
+		}
+
+		if git.IsGitRepo(repo.Path) {
+			fmt.Fprintf(os.Stderr, "⊘ Skipped (.git exists): %s\n", repo.Path)
+			continue
+		}
+
+		if err := git.Revert(repo.Path); err != nil {
+			fmt.Fprintf(os.Stderr, "✗ Failed to revert %s: %v\n", repo.Path, err)
+			failed++
+			continue
+		}
+
+		cfg.RemoveRepo(repo.Path)
+		fmt.Printf("✓ Reverted: %s\n", repo.Path)
+		reverted++
+	}
+
+	if err := cfg.Save(); err != nil {
+		return fmt.Errorf("failed to save config: %w", err)
+	}
+
+	fmt.Printf("\nSuccessfully reverted %d repositories", reverted)
+	if failed > 0 {
+		fmt.Printf(" (%d failed)", failed)
+	}
+	fmt.Println()
+
+	return nil
+}