s/sh: fix case patterns for argument-taking commands

Quoted '*' in rc switch cases is a literal character, not a wildcard.
Replace '/cmd *' patterns with /cmd?* so rc treats them as globs.

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

scripts/s/sh

@@ -229,25 +229,25 @@ done; exit 1'}
 		case /cwd
 			cfg_get cwd
 			echo
-		case '/cwd *'
+		case /cwd?*
 			newcwd=`{printf '%s\n' $"input | sed 's,^/cwd ,,'}
 			printf 'cwd=%s\n' $newcwd > $S/cfg
 		case /agent
 			cfg_get agent
 			echo
-		case '/agent *'
+		case /agent?*
 			printf 'agent=%s\n' `{printf '%s\n' $"input | sed 's,^/agent ,,'} > $S/cfg
 			show_new
 		case /model
 			cfg_get model
 			echo
-		case '/model *'
+		case /model?*
 			printf 'model=%s\n' `{printf '%s\n' $"input | sed 's,^/model ,,'} > $S/cfg
 			show_new
 		case /backend
 			cfg_get backend
 			echo
-		case '/backend *'
+		case /backend?*
 			printf 'backend=%s\n' `{printf '%s\n' $"input | sed 's,^/backend ,,'} > $S/cfg
 			show_new
 		case /models
@@ -260,13 +260,13 @@ done; exit 1'}
 			cat $S/ctxsz >[2]/dev/null
 		case /mcp
 			cat $S/mcp >[2]/dev/null
-		case '/rn *'
+		case /rn?*
 			newid=`{printf '%s\n' $"input | sed 's,^/rn ,,'}
 			printf 'rn %s\n' $newid > $S/ctl
 			id=$newid
 			S=$MOUNT/s/$id
 			save_session $_dir $id
-		case '/q *'
+		case /q?*
 			printf '%s\n' `{printf '%s\n' $"input | sed 's,^/q ,,'} > $S/fifo.in
 			printf 'queued\n' >[1=2]
 		case /*