Replacing a configured plugin dist directory disables hot reload

Description

A configured local plugin such as /plugin/dist/index.js is watched at the entrypoint. Replacing dist/ during a build destroys that watch, and the transient missing entrypoint removes the working plugin generation. Recreating dist/index.js then does not restore it without restarting OpenCode.

This is narrower than #39987: normal edits reload, but generated-directory replacement loses both the watch and the last valid generation.

Plugins

Configured local plugin built to dist/index.js

OpenCode version

V2 at 2c8e2a2b2

Steps to reproduce

1. Configure a local plugin at /plugin/dist/index.js.
2. Start OpenCode and confirm the plugin is active.
3. Replace dist/ as part of a build.
4. Observe the plugin disappears and the recreated entrypoint is not activated until restart.

Screenshot and/or share link

N/A

Operating System

macOS (also applies to directory-replacing builds elsewhere)

Terminal

Any