fix(core): load built-in skill asset at runtime

packages/opencode/src/skill/index.ts

@@ -15,7 +15,6 @@ import { RuntimeFlags } from "@/effect/runtime-flags"
 import { Glob } from "@opencode-ai/core/util/glob"
 import * as Log from "@opencode-ai/core/util/log"
 import { Discovery } from "./discovery"
-import CUSTOMIZE_OPENCODE_SKILL_BODY from "../../../core/src/plugin/skill/customize-opencode.md" with { type: "text" }
 import { isRecord } from "@/util/record"
 
 const log = Log.create({ service: "skill" })
@@ -33,6 +32,9 @@ const SKILL_PATTERN = "**/SKILL.md"
 const CUSTOMIZE_OPENCODE_SKILL_NAME = "customize-opencode"
 const CUSTOMIZE_OPENCODE_SKILL_DESCRIPTION =
   "Use ONLY when the user is editing or creating opencode's own configuration: opencode.json, opencode.jsonc, files under .opencode/, or files under ~/.config/opencode/. Also use when creating or fixing opencode agents, subagents, skills, plugins, MCP servers, or permission rules. Do not use for the user's own application code, or for any project that is not configuring opencode itself."
+const CUSTOMIZE_OPENCODE_SKILL_BODY = await Bun.file(
+  new URL("../../../core/src/plugin/skill/customize-opencode.md", import.meta.url),
+).text()
 
 export const Info = Schema.Struct({
   name: Schema.String,