Add classifier hits and alerts pipeline

Add NATS subjects + ClickHouse tables for classifier hits/alerts, evaluate sweep/spike rules in compute, expose API/WS endpoints, and cover storage helpers with tests.

packages/storage/tests/alerts.test.ts

@@ -0,0 +1,36 @@
+import { describe, expect, it } from "bun:test";
+import { alertsTableDDL, ALERTS_TABLE, fromAlertRecord, toAlertRecord } from "../src/alerts";
+
+const alert = {
+  source_ts: 10,
+  ingest_ts: 20,
+  seq: 1,
+  trace_id: "alert:fp-1",
+  score: 78,
+  severity: "medium",
+  hits: [
+    {
+      classifier_id: "large_bullish_call_sweep",
+      confidence: 0.72,
+      direction: "bullish",
+      explanations: ["Likely call sweep.", "Premium $50000."]
+    }
+  ],
+  evidence_refs: ["flowpacket:1", "print:1"]
+};
+
+describe("alerts storage helpers", () => {
+  it("includes the correct table name in the DDL", () => {
+    const ddl = alertsTableDDL();
+    expect(ddl).toContain(ALERTS_TABLE);
+    expect(ddl).toContain("CREATE TABLE IF NOT EXISTS");
+  });
+
+  it("round-trips alert records", () => {
+    const record = toAlertRecord(alert);
+    const restored = fromAlertRecord(record);
+    expect(restored.hits).toEqual(alert.hits);
+    expect(restored.evidence_refs).toEqual(alert.evidence_refs);
+    expect(restored.severity).toBe(alert.severity);
+  });
+});