test(codex): add real plugin lifecycle smoke

[corylanou]

Summary

• add a dedicated real-Codex 0.144.6 lifecycle job with an isolated home, local Git marketplace, and deterministic local Responses server
• verify first-install SessionStart and Stop hooks, retain exact hook paths for a session active across an update, and verify a fresh post-update session
• preserve already-published plugin roots across Codex marketplace reconciliation until explicit pruning

Validation

• scripts/test-installation.sh
• scripts/test-codex-plugin-lifecycle.sh with Codex 0.144.6
• Bash syntax, shellcheck, and Python byte compilation for touched scripts
• configured full Detent validation gate

Fixes #252

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Skip restoring broken current cache roots

If a prior --user run was interrupted and left the current-version cache root incomplete, this restore path backs up that broken directory, lets codex plugin add recreate a good one, and then deletes the fresh target and copies the broken backup back over it. In that recovery scenario the installer exits successfully but the plugin remains missing files or executable hooks, so a normal rerun cannot heal the cache; only restore roots that were actually removed/superseded, or avoid overwriting an existing freshly installed target.

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