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/server/src/handlers/location.ts

@@ -0,0 +1,18 @@
+import { Location } from "@opencode-ai/core/location"
+import { Effect } from "effect"
+import { HttpApiBuilder } from "effect/unstable/httpapi"
+import { Api } from "../api"
+
+export const LocationHandler = HttpApiBuilder.group(Api, "server.location", (handlers) =>
+  handlers.handle(
+    "location.get",
+    Effect.fn(function* () {
+      const location = yield* Location.Service
+      return new Location.Info({
+        directory: location.directory,
+        workspaceID: location.workspaceID,
+        project: location.project,
+      })
+    }),
+  ),
+)