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/core/test/lib/tool.ts

@@ -0,0 +1,20 @@
+import { AgentV2 } from "@opencode-ai/core/agent"
+import { SessionMessage } from "@opencode-ai/core/session/message"
+import { ToolRegistry } from "@opencode-ai/core/tool/registry"
+import { Effect } from "effect"
+
+export const toolIdentity = {
+  agent: AgentV2.ID.make("build"),
+  assistantMessageID: SessionMessage.ID.make("msg_tool_test"),
+}
+
+export const toolDefinitions = (
+  registry: ToolRegistry.Interface,
+  permissions?: Parameters<typeof registry.materialize>[0],
+) => registry.materialize(permissions).pipe(Effect.map((materialized) => materialized.definitions))
+
+export const settleTool = (registry: ToolRegistry.Interface, input: ToolRegistry.ExecuteInput) =>
+  registry.materialize().pipe(Effect.flatMap((materialized) => materialized.settle(input)))
+
+export const executeTool = (registry: ToolRegistry.Interface, input: ToolRegistry.ExecuteInput) =>
+  settleTool(registry, input).pipe(Effect.map((settlement) => settlement.result))