feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- System prompt injection for routing
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/console/app/test/rateLimiter.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, test } from "bun:test"
+import { getRetryAfterDay } from "../src/routes/zen/util/ipRateLimiter"
+
+describe("getRetryAfterDay", () => {
+  test("returns full day at midnight UTC", () => {
+    const midnight = Date.UTC(2026, 0, 15, 0, 0, 0, 0)
+    expect(getRetryAfterDay(midnight)).toBe(86_400)
+  })
+
+  test("returns remaining seconds until next UTC day", () => {
+    const noon = Date.UTC(2026, 0, 15, 12, 0, 0, 0)
+    expect(getRetryAfterDay(noon)).toBe(43_200)
+  })
+
+  test("rounds up to nearest second", () => {
+    const almost = Date.UTC(2026, 0, 15, 23, 59, 59, 500)
+    expect(getRetryAfterDay(almost)).toBe(1)
+  })
+})