fix: update changelog and installer script output

CHANGELOG.md

@@ -7,6 +7,9 @@
 - This prepares the upcoming `0.5.0` persistence release. Herdr is moving from the old single-binary update model toward a persistent server/client session model, so your workspace can keep running while clients attach, detach, and reconnect.
 - The reason for this change is upgrade safety. Herdr needs to stop the old running process cleanly before the new client/server model takes over, so manual update avoids mixed-version states during the transition.
 
+### Added
+- Hook-reported agent state can now use custom agent labels, so integrations are no longer limited to herdr’s built-in agent names. Custom labels now flow through pane/workspace UI and the socket API anywhere agent names are shown.
+
 ## [0.4.10] - 2026-04-14
 
 ### Added

website/install.sh

@@ -75,9 +75,9 @@ main() {
     echo ""
 }
 
-log()  { echo "  \033[32m>\033[0m $1"; }
-warn() { echo "  \033[33m!\033[0m $1"; }
-err()  { echo "  \033[31m✗\033[0m $1" >&2; exit 1; }
+log()  { printf '  \033[32m>\033[0m %s\n' "$1"; }
+warn() { printf '  \033[33m!\033[0m %s\n' "$1"; }
+err()  { printf '  \033[31m✗\033[0m %s\n' "$1" >&2; exit 1; }
 
 need() {
     if ! command -v "$1" >/dev/null 2>&1; then