feat(cli): add report command for filing bugs/features from the CLI

Adds `relspec report bug|feature <title>` which files an issue directly
against the RelSpec tracker, tagging the title with the system's OS
machine-id (falling back to a persisted UUID) and rate-limiting
submissions to one per minute via a local state file.

Closes #14

cmd/relspec/root.go

@@ -70,5 +70,6 @@ func init() {
 	rootCmd.AddCommand(mergeCmd)
 	rootCmd.AddCommand(splitCmd)
 	rootCmd.AddCommand(versionCmd)
+	rootCmd.AddCommand(reportCmd)
 	rootCmd.PersistentFlags().BoolVar(&prisma7, "prisma7", false, "Use Prisma 7 generator conventions when reading/writing Prisma schemas")
 }