The -900k alias fix hand-rolled a second copy of the Astra slug set and its
vendor-prefix normalization. agent/reasoning_effort.py::is_astra_model is the
documented single home for that set (picker, effort vocabulary and request
sanitizer already key off it), so the gate now calls it and a future Astra
alias stays a one-line edit. The gpt-5.6 marker check is back to main's exact
form.
Tests move into the existing parametrized Astra gate table, which checks both
the capability resolver and the per-request gate: -900k on official Codex OAuth
is eligible; -900k through a relay or on provider openai is not. Docs and the
config example no longer say "exact gpt-6-astra".
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