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
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/opencode/test/cli/tui/attach.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, test } from "bun:test"
+
+describe("tui attach", () => {
+  test("loads the TUI integration lazily", async () => {
+    const source = await Bun.file(new URL("../../../src/cli/cmd/attach.ts", import.meta.url)).text()
+
+    expect(source).toContain('await import("../tui/layer")')
+    expect(source).toMatch(/await import\(["']@\/plugin\/tui\/runtime["']\)/)
+    expect(source).not.toContain('import("./app")')
+  })
+})