[codex] Add auth mode to plugin manager constructor

[felixxia-oai]

Context

Plugins can expose more than one way for Codex to use them: App connectors for ChatGPT/SIWC-backed sessions and MCP servers for API key login sessions. The broader goal is to make PluginsManager the place that understands which plugin surfaces should be visible for the current auth route, so callers do not each have to make that decision themselves.

This PR is the small setup step for that work. It lets the plugin manager be created with the current AuthMode, which gives the followup auth routing PRs the information they need without relying on setter injection.

Stack

• PR1: [codex] Add auth mode to plugin manager constructor #27652 seed plugin manager auth at construction.
• PR2: [codex] Gate plugin MCP servers by auth route #27459 route plugin surfaces by auth mode.
• PR3: [codex] Dedupe plugin MCPs by app declaration name #27607 dedupe plugin MCP servers by App declaration name.
• PR4: [codex] Preserve plugin apps in connector listings #27602 preserve plugin Apps in connector listings.
• PR5: [codex] Skip plugin MCP OAuth for matching app routes #27461 skip install-time plugin MCP OAuth for matching App routes.

Summary

• Let PluginsManager::new_with_restriction_product accept an initial AuthMode.
• Keep PluginsManager::new behavior unchanged for ordinary callers.

Validation

cargo test -p codex-core-plugins plugins_manager_tracks_auth_mode
cargo test -p codex-core list_tool_suggest_discoverable_plugins
git diff --check

[felixxia-oai]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: c9ab74cec3

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[felixxia-oai]

I have read the CLA Document and I hereby sign the CLA

[felixxia-oai]

recheck

[xl-openai]

@codex review again

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".