fix: 修正 logo 中 N 和 G 字母造型

N 添加对角线笔画（█▄ █），G 添加内横杠（█ ▀█），
避免与 O 字母造型雷同。同步更新 ui.ts 中的硬编码 wordmark。

packages/opencode/test/tool/skill.test.ts

@@ -0,0 +1,136 @@
+import { PermissionV1 } from "@opencode-ai/core/v1/permission"
+import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
+import { Ripgrep } from "@opencode-ai/core/ripgrep"
+import { Cause, Effect, Exit, Layer } from "effect"
+import { afterEach, describe, expect } from "bun:test"
+import path from "path"
+import { pathToFileURL } from "url"
+import type { Permission } from "../../src/permission"
+import type { Tool } from "@/tool/tool"
+import { SkillTool } from "../../src/tool/skill"
+import { ToolRegistry } from "@/tool/registry"
+import { disposeAllInstances, TestInstance } from "../fixture/fixture"
+import { SessionID, MessageID } from "../../src/session/schema"
+import { testEffect } from "../lib/effect"
+
+const baseCtx: Omit<Tool.Context, "ask"> = {
+  sessionID: SessionID.make("ses_test"),
+  messageID: MessageID.make("msg_test"),
+  callID: "",
+  agent: "build",
+  abort: AbortSignal.any([]),
+  messages: [],
+  metadata: () => Effect.void,
+}
+
+afterEach(async () => {
+  await disposeAllInstances()
+})
+
+const node = CrossSpawnSpawner.defaultLayer
+
+const it = testEffect(Layer.mergeAll(ToolRegistry.defaultLayer, node).pipe(Layer.provide(Ripgrep.defaultLayer)))
+
+describe("tool.skill", () => {
+  it.instance("execute returns skill content block with files", () =>
+    Effect.gen(function* () {
+      const dir = (yield* TestInstance).directory
+      const skill = path.join(dir, ".opencode", "skill", "tool-skill")
+      yield* Effect.promise(() =>
+        Bun.write(
+          path.join(skill, "SKILL.md"),
+          `---
+name: tool-skill
+description: Skill for tool tests.
+---
+
+# Tool Skill
+
+Use this skill.
+`,
+        ),
+      )
+      yield* Effect.promise(() => Bun.write(path.join(skill, "scripts", "demo.txt"), "demo"))
+
+      const home = process.env.OPENCODE_TEST_HOME
+      process.env.OPENCODE_TEST_HOME = dir
+      yield* Effect.addFinalizer(() =>
+        Effect.sync(() => {
+          process.env.OPENCODE_TEST_HOME = home
+        }),
+      )
+
+      const registry = yield* ToolRegistry.Service
+      const agent = { name: "build", mode: "primary" as const, permission: [], options: {} }
+      const tool = (yield* registry.tools({
+        providerID: "opencode" as any,
+        modelID: "gpt-5" as any,
+        agent,
+      })).find((tool) => tool.id === SkillTool.id)
+      if (!tool) throw new Error("Skill tool not found")
+
+      expect(tool.description).not.toContain("tool-skill")
+      expect(tool.description).not.toContain("Skill for tool tests.")
+
+      const requests: Array<Omit<PermissionV1.Request, "id" | "sessionID" | "tool">> = []
+      const ctx: Tool.Context = {
+        ...baseCtx,
+        ask: (req) =>
+          Effect.sync(() => {
+            requests.push(req)
+          }),
+      }
+
+      const result = yield* tool.execute({ name: "tool-skill" }, ctx)
+      const file = path.resolve(skill, "scripts", "demo.txt")
+
+      expect(requests.length).toBe(1)
+      expect(requests[0].permission).toBe("skill")
+      expect(requests[0].patterns).toContain("tool-skill")
+      expect(requests[0].always).toContain("tool-skill")
+      expect(result.metadata.dir).toBe(skill)
+      expect(result.output).toContain(`<skill_content name="tool-skill">`)
+      expect(result.output).toContain(`Base directory for this skill: ${pathToFileURL(skill).href}`)
+      expect(result.output).toContain(`<file>${file}</file>`)
+    }),
+  )
+
+  it.instance("execute preserves not found message", () =>
+    Effect.gen(function* () {
+      const dir = (yield* TestInstance).directory
+      const home = process.env.OPENCODE_TEST_HOME
+      process.env.OPENCODE_TEST_HOME = dir
+      yield* Effect.addFinalizer(() =>
+        Effect.sync(() => {
+          process.env.OPENCODE_TEST_HOME = home
+        }),
+      )
+
+      const registry = yield* ToolRegistry.Service
+      const agent = { name: "build", mode: "primary" as const, permission: [], options: {} }
+      const tool = (yield* registry.tools({
+        providerID: "opencode" as any,
+        modelID: "gpt-5" as any,
+        agent,
+      })).find((tool) => tool.id === SkillTool.id)
+      if (!tool) throw new Error("Skill tool not found")
+
+      const exit = yield* tool
+        .execute(
+          { name: "missing-skill" },
+          {
+            ...baseCtx,
+            ask: () => Effect.void,
+          },
+        )
+        .pipe(Effect.exit)
+
+      expect(Exit.isFailure(exit)).toBe(true)
+      if (Exit.isFailure(exit)) {
+        const error = Cause.squash(exit.cause)
+        expect(error).toBeInstanceOf(Error)
+        if (error instanceof Error) expect(error.message).toContain('Skill "missing-skill" not found.')
+      }
+    }),
+  )
+})