feat(@scripts): ✨ add rsend cli tool for broadcasting messages

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

bin/rsend

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# rsend — send a message into a Clare-managed conversation.
+#
+# Usage:
+#   rsend <convo> <message...>
+#
+# <convo>    A Clare project name, or @group, that has live Claude sessions
+#            assigned to it (see `clare status`).
+# <message>  Free text. Joined with spaces and delivered as a user prompt to
+#            every assigned session.
+#
+# Examples:
+#   rsend roadmap "are we still blocked on auth?"
+#   rsend @backend "deploy is green, you can resume merges"
+#
+# Implementation: thin wrapper over `clare broadcast <convo> <msg> --yes`.
+# Requires the `clare` CLI on $PATH (https://…/@clare).
+
+set -euo pipefail
+
+if [ $# -lt 2 ] || [ "${1:-}" = "-h" ] || [ "${1:-}" = "--help" ]; then
+    cat >&2 <<'USAGE'
+usage: rsend <convo> <message...>
+
+  <convo>    Clare project name or @group
+  <message>  text to deliver (any number of args, joined with spaces)
+
+Lists live targets:   clare status
+USAGE
+    exit 2
+fi
+
+target="$1"; shift
+
+if ! command -v clare >/dev/null 2>&1; then
+    echo "rsend: 'clare' not found on PATH — install @clare first" >&2
+    exit 127
+fi
+
+exec clare broadcast "$target" "$@" --yes