feature/go-rewrite : base Go avec walk GUI

- Rewrite complet en Go : exe unique sans _internal/, sans extraction temp
- GUI Windows-native via github.com/lxn/walk (TableView, TextEdit, PushButton)
- Meme fonctionnalites : check repos, pull, checkout, auto-update, logs
- build.bat : go build -ldflags "-H windowsgui -s -w" -> 9.6 Mo, zero dependance

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

_internal/_tcl_data/parray.tcl

@@ -1,28 +0,0 @@
-# parray:
-# Print the contents of a global array on stdout.
-#
-# Copyright (c) 1991-1993 The Regents of the University of California.
-# Copyright (c) 1994 Sun Microsystems, Inc.
-#
-# See the file "license.terms" for information on usage and redistribution
-# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-#
-
-proc parray {a {pattern *}} {
-    upvar 1 $a array
-    if {![array exists array]} {
-	return -code error "\"$a\" isn't an array"
-    }
-    set maxl 0
-    set names [lsort [array names array $pattern]]
-    foreach name $names {
-	if {[string length $name] > $maxl} {
-	    set maxl [string length $name]
-	}
-    }
-    set maxl [expr {$maxl + [string length $a] + 2}]
-    foreach name $names {
-	set nameString [format %s(%s) $a $name]
-	puts stdout [format "%-*s = %s" $maxl $nameString $array($name)]
-    }
-}