fix(skill): emit base directory as filesystem path, not file:// URL (#33580)

Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/core/test/tool-skill.test.ts

@@ -1,6 +1,5 @@
 import fs from "fs/promises"
 import path from "path"
-import { pathToFileURL } from "url"
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
 import { FSUtil } from "@opencode-ai/core/fs-util"
@@ -90,7 +89,7 @@ describe("SkillTool", () => {
               value: SkillTool.toModelOutput(info, [reference]),
             })
             expect(SkillTool.toModelOutput(info, [reference])).toContain(
-              `Base directory for this skill: ${pathToFileURL(directory).href}`,
+              `Base directory for this skill: ${directory}`,
             )
             expect(
               yield* settleTool(registry, {