feat: implement AI-assisted rename prompting feature

- Added data model for AI-assisted renaming including structures for prompts, responses, and policies.
- Created implementation plan detailing the integration of Google Genkit into the CLI for renaming tasks.
- Developed quickstart guide for setting up and using the new AI rename functionality.
- Documented research decisions regarding Genkit orchestration and prompt composition.
- Established tasks for phased implementation, including setup, foundational work, and user stories.
- Implemented contract tests to ensure AI rename policies and ledger metadata are correctly applied.
- Developed integration tests for validating AI rename flows, including preview, apply, and undo functionalities.
- Added tooling to pin Genkit dependency for consistent builds.

cmd/root.go

@@ -15,8 +15,9 @@ var rootCmd = &cobra.Command{
 	Use:   "renamer",
 	Short: "Safe, scriptable batch renaming utility",
 	Long: `Renamer provides preview-first, undoable rename operations for files and directories.
-Use subcommands like "preview", "rename", and "list" with shared scope flags to target exactly
-the paths you intend to change.`,
+Use subcommands like "list", "replace", "ai", and "undo" with shared scope flags to target
+the paths you intend to change. Each command supports --dry-run previews and ledger-backed undo
+workflows so you can safely iterate before applying changes.`,
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.
@@ -52,6 +53,7 @@ func NewRootCommand() *cobra.Command {
 	cmd.AddCommand(newRegexCommand())
 	cmd.AddCommand(newSequenceCommand())
 	cmd.AddCommand(newUndoCommand())
+	cmd.AddCommand(newAICommand())
 
 	return cmd
 }