opencode debug info should show basename for file:// plugin specs

Description

The plugins: section of opencode debug info is inconsistent. npm plugins show as their package name, but local auto-discovered plugins show as full file:/// URLs, which is noisy and hard to scan.

With two plugins in ~/.config/opencode/plugins/, I get:

plugins:
- oh-my-openagent@latest
- envsitter-guard
- file:///C:/Users/Zephyrus/.config/opencode/plugins/rtk.ts
- file:///C:/Users/Zephyrus/.config/opencode/plugins/open-code-review.ts

I'd expect the local ones to render as rtk.ts and open-code-review.ts so the section is consistent.

Plugins

rtk.ts, open-code-review.ts (local auto-discovered)

OpenCode version

1.18.11

Steps to reproduce

1. Drop a .ts file into ~/.config/opencode/plugins/ (or ~/.config/opencode/plugin/).
2. Run opencode debug info.
3. Observe that the local plugin is printed as a file:// URL while npm plugins are printed by package name.

Operating System

Windows 11

Terminal

PowerShell