pkgbuild: Install auto-update launch shim

Replace the /usr/bin/grok-bot (and sand) plain symlink with a launch
shim that checks the latest Gitea release, pacman -U's a newer
.pkg.tar.zst when available, then execs the real binary under
/opt/Grok Bot/. Skip with GROK_BOT_NO_UPDATE=1; fail soft on
network/API errors. Bump pkgrel for the packaging change.

#2

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = grok-bot-bin
 	pkgdesc = Grok Bot desktop agent (official .deb repackaged)
 	pkgver = 0.30.0
-	pkgrel = 1
+	pkgrel = 2
 	url = https://cursor.com/download/bot
 	arch = x86_64
 	license = LicenseRef-proprietary
@@ -18,6 +18,7 @@ pkgbase = grok-bot-bin
 	depends = nss
 	depends = xdg-utils
 	optdepends = libappindicator-gtk3: tray icon support
+	optdepends = curl: auto-update check on launch
 	provides = grok-bot
 	provides = sand
 	conflicts = grok-bot
@@ -26,7 +27,9 @@ pkgbase = grok-bot-bin
 	options = !strip
 	options = !debug
 	source = https://downloads.cursor.com/grokbot/stable/2385d097738b3719cc5ecd9281a107aa106215f1/linux/x64/grok-bot_0.30.0_amd64.deb
+	source = grok-bot-launch.sh
 	noextract = grok-bot_0.30.0_amd64.deb
 	sha256sums = fb888b2204c8a51c71a9f5f9a2913ac10561f3ef6939c1245ecae4e837d4ada2
+	sha256sums = 886c8b55eb44d2f7812be50dcc1571907dc2d7e755171e67e916f497634f09eb
 
 pkgname = grok-bot-bin