[codex] [3/3] Activate endpoint plugin recommendations

[adaley-openai]

Summary

• Await endpoint recommendation selection while constructing each authenticated turn, removing the first-turn cache race.
• Snapshot and filter endpoint candidates once per turn, then use that same set for the bounded contextual user fragment, tool exposure, and exact install validation.
• Persist whether the recommendation fragment survives in model context; resumed threads without it stay on the legacy list-backed workflow, and full-context replacement recomputes the marker.
• Hide the legacy list tool in endpoint mode and preserve legacy discovery unchanged when the endpoint is disabled or unavailable.
• Keep remote plugin and connector app identities out of model-visible context and attach them only to Codex-owned elicitation metadata.

Stack

• 3/3, based on [codex] [2/3] Generalize plugin suggestion presentation #28400.
• Endpoint client and cache: [codex] [1/3] Add recommended plugin endpoint cache #28399.
• Install-schema follow-up: [codex] [4/4] Simplify recommended plugin install schema #28403.

Validation

• just test -p codex-protocol
• just test -p codex-state -p codex-rollout
• just test -p codex-core request_plugin_install
• just test -p codex-core full_context_reinjection_clears_stale_recommended_plugins_marker
• just test -p codex-app-server first_turn_after_external_login_waits_for_recommended_plugins
• just fix -p codex-core -p codex-protocol -p codex-app-server
• just fmt
• git diff --check
• Full just test -p codex-core: 2,649 passed and 88 environment-dependent tests failed because this sandbox cannot write ~/.codex/sqlite, nest Seatbelt, or locate auxiliary test binaries.

[chatgpt-codex-connector]

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