fix: convert import.meta.resolve result to file:// URL for plugins

[abc-lee]

Summary

On Windows, import.meta.resolve() returns a raw filesystem path instead of a file:// URL. This causes the plugin name extraction logic to fail, displaying the full raw path in the UI.

How to Test

1. On Windows, add a plugin in opencode.json: "plugin": ["oh-my-opencode@latest"]
2. Start OpenCode and check the plugin list in /status dialog
3. Before fix: Shows raw path like C:\Users\Username\ or E:\opencode\
4. After fix: Shows correct plugin name oh-my-opencode @latest

Test Plan

• Verified fix resolves the issue on Windows
• Code change is minimal and matches existing require.resolve() fallback pattern
• CI tests pass

Fixes #16559

[github-actions]

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[github-actions]

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on the search results, here are potential related PRs:

1. fix(config): avoid dedup collisions for file:// plugins in node_modules #15598 - fix(config): avoid dedup collisions for file:// plugins in node_modules

   • Related because it also deals with file:// URL handling for plugins and deduplication logic

2. fix(opencode): prevent plugin deduplication collision for index.js entry points #11161 - fix(opencode): prevent plugin deduplication collision for index.js entry points

   • Related because it addresses plugin deduplication issues, which may be impacted by path format inconsistencies

Both PRs appear to address plugin path handling and deduplication issues, which are closely related to the current PR's fix for ensuring consistent file:// URL conversion. These should be reviewed to ensure compatibility and avoid overlapping fixes.

[abc-lee]

CI Failure Analysis

The CI failure is not caused by this PR.

The failing test packages/opencode/test/util/process.test.ts:61 uses /tmp as the working directory:

test("uses cwd when spawning commands", async () => {
  const out = await Process.run(node("process.stdout.write(process.cwd())"), {
    cwd: "/tmp",  // ? This path does not exist on Windows
  })
  expect(out.stdout.toString()).toBe("/tmp")
})

This test fails on Windows because /tmp is a Linux/Unix path that does not exist on Windows. This is a pre-existing issue in the codebase.

My change (in packages/opencode/src/config/config.ts) is unrelated to this test - it only adds a pathToFileURL() conversion for plugin paths.

Suggestion

The test should use a cross-platform temp directory approach:

import { tmpdir } from "os"
// or use the test fixture mentioned in test/AGENTS.md

[github-actions]

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