deploy: match Unknown-channel warnings by pipeline format

Agent tool-call echoes also hit this journal and can contain the literal
string; require '| WARNING | - | Unknown channel:' to avoid false
positives in the channel check.

scripts/deploy.sh

@@ -98,9 +98,12 @@ verify_deps() {
 channels_check() {  # $1 = since timestamp; 0 if all expected channels are up
     local since="$1" journal enabled ch
     journal=$(journal_since "$since")
-    if grep -q "Unknown channel" <<<"$journal"; then
+    # Match the actual warning-pipeline format, not bare 'Unknown channel' —
+    # the gateway also logs agent tool calls to this journal, and those echo
+    # the literal string when the agent greps for it (false positives).
+    if grep -qF '| WARNING | - | Unknown channel:' <<<"$journal"; then
         log "CHANNEL CHECK FAILED: 'Unknown channel' logged since restart:"
-        grep "Unknown channel" <<<"$journal" | head -3 | sed 's/^/[deploy]     /'
+        grep -F '| WARNING | - | Unknown channel:' <<<"$journal" | head -3 | sed 's/^/[deploy]     /'
         return 1
     fi
     enabled=$(grep -o "Channels enabled:.*" <<<"$journal" | tail -1 | sed 's/Channels enabled: *//' || true)