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## Summary - validate `js_repl` Node compatibility during session startup when the experiment is enabled - if Node is missing or too old, disable `js_repl` and `js_repl_tools_only` for the session before tools and instructions are built - surface that startup disablement to users through the existing startup warning flow instead of only logging it - reuse the same compatibility check in js_repl kernel startup so startup gating and runtime behavior stay aligned - add a regression test that verifies the warning is emitted and that the first advertised tool list omits `js_repl` and `js_repl_reset` when Node is incompatible ## Why Today `js_repl` can be advertised based only on the feature flag, then fail later when the kernel starts. That makes the available tool list inaccurate at the start of a conversation, and users do not get a clear explanation for why the tool is unavailable. This change makes tool availability reflect real startup checks, keeps the advertised tool set stable for the lifetime of the session, and gives users a visible warning when `js_repl` is disabled. ## Testing - `just fmt` - `cargo test -p codex-core --test all js_repl_is_not_advertised_when_startup_node_is_incompatible`