Use Codex app-server install and drop global rescue agent

[sf-jin-ku]

Summary

• install and uninstall through Codex app-server when available, with safe fallback activation on unsupported builds
• remove the global cc-rescue agent and keep only managed Codex hooks outside the plugin directory
• switch rescue to the built-in forwarding subagent path, harden self-clean behavior, and document unread background-result nudges

Testing

• node --test tests/install-hooks.test.mjs tests/installer-cli.test.mjs tests/render.test.mjs tests/e2e/codex-skills-e2e.test.mjs tests/skills-contracts.test.mjs tests/unread-result-hook.test.mjs

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove legacy managed cc-rescue registration during uninstall

This uninstall cleanup now removes only [plugins."cc@local-plugins"], so users upgrading from earlier releases keep the previously managed cc-rescue global-agent artifacts ([agents."cc-rescue"] in config.toml and ~/.codex/agents/cc-rescue.toml). After uninstall deletes the plugin directory, that leftover agent registration becomes stale and can still surface a broken rescue agent path; uninstall should also prune the managed legacy agent block/file (while leaving user-customized agent entries intact).

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