Add announce script for posting to Discord channels

Usage: ./scripts/announce.sh "message" [channel_name]
Fetches the bot token from barge, resolves channel by name,
and posts via the Discord API. Defaults to #general.

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

scripts/announce.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+# Post an announcement to a Discord channel using the bot's token.
+# Usage: ./scripts/announce.sh "Your message here" [channel_name]
+# Default channel: general
+
+set -euo pipefail
+
+MESSAGE="${1:?Usage: announce.sh \"message\" [channel_name]}"
+CHANNEL_NAME="${2:-general}"
+
+# Fetch bot token from barge
+TOKEN=$(ssh aj@barge.lan "grep DISCORD_BOT_TOKEN /mnt/docker/breehavior-monitor/.env" | cut -d= -f2-)
+
+if [[ -z "$TOKEN" ]]; then
+    echo "ERROR: Could not read bot token from barge." >&2
+    exit 1
+fi
+
+# Get guilds the bot is in
+GUILDS=$(curl -s -H "Authorization: Bot $TOKEN" "https://discord.com/api/v10/users/@me/guilds")
+GUILD_ID=$(echo "$GUILDS" | python -c "import sys,json; print(json.load(sys.stdin)[0]['id'])")
+
+if [[ -z "$GUILD_ID" ]]; then
+    echo "ERROR: Could not find guild." >&2
+    exit 1
+fi
+
+# Get channels and find the target by name
+CHANNEL_ID=$(curl -s -H "Authorization: Bot $TOKEN" "https://discord.com/api/v10/guilds/$GUILD_ID/channels" \
+    | python -c "
+import sys, json
+channels = json.load(sys.stdin)
+for ch in channels:
+    if ch['name'] == sys.argv[1] and ch['type'] == 0:
+        print(ch['id'])
+        break
+" "$CHANNEL_NAME")
+
+if [[ -z "$CHANNEL_ID" ]]; then
+    echo "ERROR: Channel #$CHANNEL_NAME not found." >&2
+    exit 1
+fi
+
+# Build JSON payload safely
+PAYLOAD=$(python -c "import json,sys; print(json.dumps({'content': sys.argv[1]}))" "$MESSAGE")
+
+# Post the message
+RESPONSE=$(curl -s -w "\n%{http_code}" -X POST \
+    -H "Authorization: Bot $TOKEN" \
+    -H "Content-Type: application/json" \
+    -d "$PAYLOAD" \
+    "https://discord.com/api/v10/channels/$CHANNEL_ID/messages")
+
+HTTP_CODE=$(echo "$RESPONSE" | tail -1)
+
+if [[ "$HTTP_CODE" == "200" ]]; then
+    echo "Posted to #$CHANNEL_NAME"
+else
+    BODY=$(echo "$RESPONSE" | sed '$d')
+    echo "ERROR: HTTP $HTTP_CODE" >&2
+    echo "$BODY" >&2
+    exit 1
+fi