fix(webicached): don't treat 0-asset packages as perpetually stale

Packages that produce no classifiable assets (e.g. mariadb-galera with
the galera asset_filter) were being refetched every batch because
!hasAssets marked them stale regardless of timestamp. The hasAssets
condition was intended for the startup case (classified from empty
rawcache), but those packages are already caught by t.IsZero() on first
run. Respect the timestamp for 0-asset results as for any other package.

mariadb-galera/releases.conf

@@ -0,0 +1,2 @@
+source = mariadbdist
+asset_filter = galera

scripts/deploy-webicached.sh

@@ -11,13 +11,13 @@ g_out="agents/tmp/${g_bin}"
 g_remote_bin="~/bin/${g_bin}"
 
 case "${g_host}" in
-	beta.webi.sh) g_remote_conf="~/srv/beta.webinstall.dev/installers/" ;;
-	next.webi.sh) g_remote_conf="~/srv/next.webinstall.dev/installers/" ;;
-	*) g_remote_conf="~/srv/webid/installers/" ;;
+beta.webi.sh) g_remote_conf="~/srv/beta.webinstall.dev/installers/" ;;
+next.webi.sh) g_remote_conf="~/srv/next.webinstall.dev/installers/" ;;
+*) g_remote_conf="~/srv/webid/installers/" ;;
 esac
 
 fn_build() {
-	b_version="$(git describe --tags --always 2> /dev/null || echo '0.0.0-dev')"
+	b_version="$(git describe --tags --always 2>/dev/null || echo '0.0.0-dev')"
 	b_commit="$(git rev-parse --short HEAD)"
 	b_date="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
 	b_ldflags="-X main.version=${b_version} -X main.commit=${b_commit} -X main.date=${b_date}"
@@ -29,14 +29,14 @@ fn_build() {
 
 fn_deploy() {
 	printf 'Stopping %s on %s...\n' "${g_bin}" "${g_host}"
-	ssh "${g_host}" "~/.local/bin/serviceman stop ${g_bin}" 2> /dev/null || true
+	ssh "${g_host}" "~/.local/bin/serviceman stop ${g_bin}" 2>/dev/null || true
 
 	printf 'Uploading binary...\n'
 	scp "${g_out}" "${g_host}:${g_remote_bin}"
 
 	printf 'Syncing releases.conf files...\n'
 	rsync -av \
-		--exclude='_cache' --exclude='.git' --exclude='.claude' --exclude='agents' \
+		--exclude='_cache' --exclude='.git' --exclude='agents' \
 		--exclude='bin' --exclude='cmd' --exclude='internal' \
 		--exclude='docs' --exclude='scripts' --exclude='node_modules' \
 		--include='*/' --include='releases.conf' --exclude='*' \