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/core/test/session-logging.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, test } from "bun:test"
+import { Cause, Effect, Logger } from "effect"
+import { logFailure } from "@opencode-ai/core/session/logging"
+import { SessionSchema } from "@opencode-ai/core/session/schema"
+
+describe("Session logging", () => {
+  for (const message of ["Failed to drain Session", "Failed to wake Session"] as const) {
+    test(`renders the cause for ${message}`, async () => {
+      const entries: Array<ReturnType<typeof Logger.formatStructured.log>> = []
+      const logger = Logger.formatStructured.pipe(
+        Logger.map((entry): void => {
+          entries.push(entry)
+        }),
+      )
+
+      await logFailure(
+        message,
+        SessionSchema.ID.make("session-123"),
+        Cause.fail({ _tag: "SessionFailure", detail: { code: "nested-code" } }),
+      ).pipe(Effect.provide(Logger.layer([logger])), Effect.runPromise)
+
+      expect(entries).toHaveLength(1)
+      expect(entries[0]?.message).toBe(message)
+      expect(entries[0]?.annotations).toEqual({ sessionID: "session-123" })
+      expect(entries[0]?.cause).toContain("SessionFailure")
+      expect(entries[0]?.cause).toContain("nested-code")
+      expect(entries[0]?.cause).not.toContain("[Object")
+    })
+  }
+})