Remove explicit connector tool undeferral

[sayan-oai]

Summary

• remove the explicit-connector carveout that kept mentioned app tools directly exposed instead of deferred
• keep the surviving explicit-mention reconstruction only for analytics, preserving codex_app_mentioned and codex_app_used.invoke_type
• trim the now-unused prompt/tool-exposure plumbing and refresh coverage around always-defer behavior

Verification

• just fmt
• cargo test -p codex-analytics
• cargo test -p codex-core (one transient timeout in shell_snapshot::tests::macos_zsh_snapshot_includes_sections; isolated rerun passed)
• cargo test -p codex-core --lib shell_snapshot::tests::macos_zsh_snapshot_includes_sections
• cargo test -p codex-core --test all explicit_app_mentions_respect_always_defer
• cargo test -p codex-core --lib mcp_tool_exposure::tests::always_defer_feature_defers_apps_too
• just fix -p codex-analytics
• just fix -p codex-core

[sayan-oai]

@codex review this. we are explicitly removing the logic that would avoid deferral of connector tools on explicit mention.

[chatgpt-codex-connector]

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

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