feat: add multi-chat routing and bill-specific dashboard countdown

tests/test_main.sh

@@ -142,6 +142,29 @@ assert_contains "${SCHEDULE[1]}" '"outage_number":"2"' \
 assert_contains "${SCHEDULE[2]}" '"outage_number":"5"' \
   "later events should remain in the schedule"
 
+build_schedule "$FIXTURE" "$NOW_EPOCH" "222"
+assert_equal "3" "${#SCHEDULE[@]}" \
+  "selecting a countdown bill should not filter the schedule"
+assert_equal "UPCOMING" "${HERO%%$'\t'*}" \
+  "the countdown should ignore another bill's ongoing outage"
+assert_contains "$HERO" '"bill_id":"222"' \
+  "the countdown should use only the selected bill"
+SELECTED_OUTPUT="$(NO_COLOR=1 COLUMNS=80 render_dashboard "$NOW_EPOCH" 80 "222")"
+assert_contains "$SELECTED_OUTPUT" "COUNTDOWN FOR BILL 222" \
+  "the selected countdown bill should be labeled"
+assert_contains "$SELECTED_OUTPUT" "OUTAGE SCHEDULE (3)" \
+  "the selected countdown bill should not hide other bills from the list"
+
+build_schedule "$FIXTURE" "$NOW_EPOCH" "333"
+assert_equal "" "$HERO" \
+  "a bill without upcoming outages should not borrow another bill's countdown"
+NO_HERO_OUTPUT="$(NO_COLOR=1 COLUMNS=80 render_dashboard "$NOW_EPOCH" 80 "333")"
+assert_contains "$NO_HERO_OUTPUT" "NO CURRENT OR UPCOMING OUTAGE" \
+  "a selected bill without outages should have a clear countdown status"
+assert_contains "$NO_HERO_OUTPUT" "OUTAGE SCHEDULE (3)" \
+  "all bills should remain listed when the selected bill has no outage"
+
+build_schedule "$FIXTURE" "$NOW_EPOCH"
 OUTPUT="$(NO_COLOR=1 COLUMNS=80 render_dashboard "$NOW_EPOCH")"
 if [[ "$OUTPUT" == *"POWER RETURNS IN"* || "$OUTPUT" == *"NEXT OUTAGE IN"* ]]; then
   printf 'FAIL: countdown output contains a redundant heading\n' >&2
@@ -219,4 +242,9 @@ if (
   exit 1
 fi
 
+if main --bill-id invalid >/dev/null 2>&1; then
+  printf 'FAIL: a non-decimal countdown bill ID was accepted\n' >&2
+  exit 1
+fi
+
 printf 'Bash CLI tests passed\n'