xli-oai def6467d2b [codex] Describe uninstalled cross-repo plugin reads (#18449) ...

## Summary
- Populate `PluginDetail.description` in core for uninstalled cross-repo
plugins when detailed fields are unavailable until install.
- Include the source Git URL plus optional path/ref/sha details in that
fallback description.
- Keep `details_unavailable_reason` as the structured signal while
app-server forwards the description normally.
- Add plugin-read coverage proving the response does not clone the
remote source just to show the message.

## Why
Uninstalled cross-repo plugins intentionally return sparse detail data
so listing/reading does not clone the plugin source. Without a
description, Desktop and TUI detail pages look like an ordinary empty
plugin. This gives users a concrete explanation and source pointer while
keeping the existing structured reason available for callers.

## Validation
- `just fmt`
- `cargo test -p codex-core
read_plugin_for_config_uninstalled_git_source_requires_install_without_cloning`
- `cargo test -p codex-app-server plugin_read --test all`
- `just fix -p codex-core`
- `just fix -p codex-app-server`

Note: `cargo test -p codex-app-server` was also attempted before the
latest refactor and failed broadly in unrelated v2
thread/realtime/review/skills suites; the new plugin-read test passed in
that run as well.

2026-04-17 20:31:13 -07:00

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