fix: install Codex-native cc skill wrappers

[inbarajaldrin]

Summary

In my Codex environment, the plugin-local skills/ directory was not surfacing as discoverable $cc:* skills. The plugin runtime, hooks, and cc-rescue agent were installed correctly, but the skills only became discoverable when installed through Codex’s native ~/.codex/skills path.

Changes

• Installer now writes namespaced cc-* skill wrappers into ~/.codex/skills
• Installer now writes matching cc-* prompt wrappers into ~/.codex/prompts
• Generated wrappers point directly at the installed companion entrypoint under ~/.codex/plugins/cc
• Uninstall removes the generated cc-* skill and prompt wrappers
• Added installer coverage for generated wrapper installation and cleanup

Verification

• node --test tests/installer-cli.test.mjs
• Fresh reinstall generates:
  • ~/.codex/skills/cc-review/SKILL.md
  • ~/.codex/skills/cc-rescue/SKILL.md
  • matching ~/.codex/prompts/cc-*.md
• $cc:setup is discoverable and reports ready
• $cc:status is discoverable and returns tracked-job status
• $cc:rescue is discoverable and successfully executes a write/read/delete test task

[sf-jin-ku]

Thanks for putting this together and for calling out the Codex skill-discovery gap. Since the plugin moved to the 1.0.1 installer flow with the official Codex app-server plugin/install path, we took a narrower follow-up in #17 instead of carrying wrapper installs all the time.

The new PR keeps official install as the primary path on current Codex builds, and limits cc-* skill/prompt wrappers to the fallback path only when plugin/install is unavailable. It also adds coverage for that compatibility path and keeps $cc:setup as the one-shot repair path for missing hooks on marketplace-style installs.

Appreciate the report and the concrete proposal here. I’m going to close this PR in favor of #17 so the discussion stays on the version that matches the current installer architecture.

[sf-jin-ku]

Closing this in favor of #17, which keeps official app-server install as the primary path on current Codex builds and narrows cc wrapper generation to the compatibility fallback only.