When a local plugin is shared, Codex now records the local plugin path
by remote plugin id under CODEX_HOME/.tmp.
plugin/share/list includes the remote share URL and the matching local
plugin path when available, and plugin/share/delete
clears the local mapping after deleting the remote share.
Also add sharedURL to plugin/share/list.
## Summary
Remote plugin-service returns plugin availability separately from a
user's installed/enabled state. This adds `PluginAvailabilityStatus` to
the app-server protocol, propagates remote catalog `status` into
`PluginSummary`, and rejects install attempts for remote plugins marked
`DISABLED_BY_ADMIN` before downloading or caching the bundle.
This is the `openai/codex` half of the change. The companion
`openai/openai` webview PR is
https://github.com/openai/openai/pull/873269.
## Validation
- `cargo run -p codex-app-server-protocol --bin write_schema_fixtures`
- `cargo test -p codex-app-server --test all
plugin_list_marks_remote_plugin_disabled_by_admin`
- `cargo test -p codex-app-server --test all
plugin_list_includes_remote_marketplaces_when_remote_plugin_enabled`
- `cargo test -p codex-app-server --test all
plugin_install_rejects_remote_plugin_disabled_by_admin_before_download`
- `cargo test -p codex-app-server-protocol schema_fixtures`
## Summary
- Download missing remote installed plugin bundles during app-server
startup and plugin/list refresh.
- Upgrade cached remote installed bundles when the backend installed
version changes.
- Remove stale remote installed bundle caches without writing remote
plugin state into config.toml.
## Review note
This is a clean PR branch cut from the current diff on top of latest
`origin/main`. The diff intentionally has no `codex-rs/core/**` files,
so CODEOWNERS should not request the core-directory owner review from
stale PR history.
## Validation
Already run on the source branch before creating this clean PR:
- `just fmt`
- `cargo test -p codex-core-plugins`
- `cargo test -p codex-app-server --test all
app_server_startup_sync_downloads_remote_installed_plugin_bundles --
--nocapture`
- `cargo test -p codex-app-server --test all
plugin_list_sync_upgrades_and_removes_remote_installed_plugin_bundles --
--nocapture`
- `cargo test -p codex-app-server --test all
app_server_startup_remote_plugin_sync_runs_once -- --nocapture`
- `just fix -p codex-core-plugins`
- `just fix -p codex-app-server`
- `git diff --check`
1. Adds v2 plugin/share/save, plugin/share/list, and plugin/share/delete
RPCs.
2. Implements save by archiving a local plugin root, enforcing a size
limit, uploading through the workspace upload flow, and supporting
updates via remotePluginId.
3. Lists created workspace plugins
4. Deletes a previously uploaded/shared plugin.
