Fleet rollout verification needs exact plugin-version telemetry

A session-start setup snapshot can prove that a Codex plugin is enabled without proving which version is active. In codex-session-logging 0.2.13, codex_plugins() records only name and enabled state; version evidence is indirect unless a versioned plugin skill path is also observed. For rollout certainty, persist a sanitized plugin name, installed version, marketplace, installation identifier, and observed-at timestamp at each context load. Source: e3-solutions/codex-plugins PR #63, plugins/codex-session-logging/scripts/session_logging.py (codex_setup_snapshot, codex_plugins, codex_skills).