test(broker): smoke test for hello + direct message flow

Adds scripts/{seed-test-mesh,peer-a,peer-b,smoke-test}.ts|.sh that
prove an end-to-end message flow works against a real Postgres:

- seed-test-mesh.ts creates user+mesh+2 members with deterministic
  hex pubkeys ("aa..aa", "bb..bb"), writes seed JSON to stdout
- peer-a.ts sends hello then a direct "send" message to peer B's
  pubkey with fake ciphertext "hello-from-a"
- peer-b.ts sends hello, waits up to 5s for a push, asserts
  senderPubkey matches peer A, exits 0/1
- smoke-test.sh wires the three together

Verified flow: hello registers presence row → send queues into
mesh.message_queue → fanout matches connected peer by pubkey →
drainForMember joins on mesh.member for senderPubkey → push lands
with ciphertext + correct sender attribution.

Also fixes a date-serialization bug that blocked the first run:
applyPendingHookStatus used `sql${col} >= ${jsDate}` which passed
JS Date.toString() to Postgres (failed to parse). Replaced raw
sql`` template with typed gte/desc/isNotNull operators from
drizzle-orm. Same fix applied in sweepPendingStatuses.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/broker/scripts/smoke-test.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# End-to-end smoke test for the broker.
+#
+# Flow:
+#   1. Seed a test mesh with 2 members → writes /tmp/smoke-seed.json
+#   2. Start peer B (receiver) in background
+#   3. Start peer A (sender)
+#   4. Wait for B → exit code is the test result
+#
+# Assumes: broker is running on ws://localhost:7900/ws, DATABASE_URL
+# is in env. Run from the broker workspace:
+#   cd apps/broker && ./scripts/smoke-test.sh
+
+set -euo pipefail
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo "── seeding test mesh ──"
+bun "$DIR/seed-test-mesh.ts" > /tmp/smoke-seed.json
+cat /tmp/smoke-seed.json
+
+echo ""
+echo "── starting peer-b (receiver) ──"
+bun "$DIR/peer-b.ts" &
+B_PID=$!
+
+sleep 1
+
+echo ""
+echo "── starting peer-a (sender) ──"
+bun "$DIR/peer-a.ts"
+
+echo ""
+echo "── waiting for peer-b ──"
+if wait $B_PID; then
+  echo "✓ smoke test PASSED"
+  exit 0
+else
+  echo "✗ smoke test FAILED"
+  exit 1
+fi