The slug pair {"gpt-6-astra", "gpt-6-astra-900k"} was spelled out five times
(reasoning_effort, transports/codex, models.py x2, codex_models) with five hand-rolled
``.strip().lower().rsplit("/", 1)[-1]`` normalisations. ``is_astra_model`` in
agent/reasoning_effort.py (the module the other four already import) is now the only home, so a
new Astra alias is one edit.
``_finalize_codex_models(..., allow_astra=)`` was a control-coupling flag set True by the two
live callers and left False by the two static ones. The filter now lives where the untrusted
inputs are — ``_drop_undiscovered_astra`` over config.toml default + models_cache.json in
``get_codex_model_ids`` — and ``_finalize_codex_models`` is back to its one-line original.
DEFAULT_CODEX_MODELS never contains Astra, so the static catalog needs no gate.
``_openai_catalog`` appends whatever Astra ids live discovery returned instead of a name-keyed
``if "gpt-6-astra" in live_lower`` branch with a literal fallback that could never fire.
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