fix: clap CLI definitions and manpage generation

- add #[group(skip)] to all Parser-derived structs
- fix conflicts_with and arg definitions for correct CLI behavior
- refactor bin entry points to support manpage generation

core/man/start-cli/start-cli-util.1

@@ -0,0 +1,17 @@
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.TH start-cli-util 1  "util " 
+.SH NAME
+start\-cli\-util \- Command for calculating the blake3 hash of a file
+.SH SYNOPSIS
+\fBstart\-cli util\fR [\fB\-h\fR|\fB\-\-help\fR] <\fIsubcommands\fR>
+.SH DESCRIPTION
+Command for calculating the blake3 hash of a file
+.SH OPTIONS
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Print help
+.SH SUBCOMMANDS
+.TP
+start\-cli\-util\-b3sum(1)
+Calculate blake3 hash for a file