refactor(core): resolve database and websearch config through Effect Config

packages/core/test/database-path.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, test } from "bun:test"
+import path from "path"
+import { ConfigProvider, Effect, Layer } from "effect"
+import { Database } from "@opencode-ai/core/database/database"
+import { Global } from "@opencode-ai/core/global"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
+import { tmpdir } from "./fixture/tmpdir"
+
+describe("Database placement", () => {
+  test("resolves explicit files, relative names, and the channel default", () => {
+    expect(Database.resolvePath({ file: ":memory:", disableChannelDb: false })).toBe(":memory:")
+    expect(Database.resolvePath({ file: "/tmp/explicit.db", disableChannelDb: false })).toBe("/tmp/explicit.db")
+    expect(Database.resolvePath({ file: "relative.db", disableChannelDb: false })).toBe(
+      path.join(Global.Path.data, "relative.db"),
+    )
+    expect(Database.resolvePath({ file: undefined, disableChannelDb: true })).toBe(
+      path.join(Global.Path.data, "opencode.db"),
+    )
+  })
+
+  test("reads placement from the active ConfigProvider when the layer is built", async () => {
+    await using tmp = await tmpdir()
+    const file = path.join(tmp.path, "config-seam.sqlite")
+
+    // The preload sets OPENCODE_DB=":memory:" in the process environment, so a
+    // database appearing at this path proves the layer reads through the
+    // replaced ConfigProvider rather than the environment snapshot.
+    await Effect.runPromise(
+      Layer.build(
+        LayerNode.compile(LayerNode.group([Database.node])).pipe(
+          Layer.provide(ConfigProvider.layer(ConfigProvider.fromUnknown({ OPENCODE_DB: file }))),
+        ),
+      ).pipe(Effect.scoped, Effect.asVoid),
+    )
+
+    expect(await Bun.file(file).exists()).toBe(true)
+  })
+})