[codex] Populate remote plugin local versions

[abhinav-oai]

What

• Carry installed remote release versions through remote plugin summaries as localVersion.
• Keep the app-server mapping a pure adapter by populating that value in the remote catalog layer.

Why

Remote plugin summaries always returned localVersion: null even after their versioned bundles had been installed locally. Consumers such as scheduled-task template discovery use localVersion to resolve a plugin's materialized root, so templates from remote curated plugins were silently skipped.

[chatgpt-codex-connector]

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[eternal-openai]

Codex: plugin/installed still returns localVersion: null for remote installed plugins. In remote.rs (line 1044), group_remote_installed_plugins_by_marketplaces now constructs RemotePluginSummary with local_version: None, but this is the path used by plugin/installed via load_remote_installed_plugins. So catalog/read/share paths get the version, while installed-plugin summaries still drop it. That leaves any consumer of plugin/installed unable to resolve the materialized remote plugin root, which is the bug this PR is meant to fix. The fix likely needs to carry the installed release version through RemoteInstalledPlugin / remote_installed_plugin_to_cache_entry and assert it in a plugin_installed_* test