ci: re-trigger test-fast (Pi OOM flake; fast build unaffected by this branch)
Only constants.hpp reaches the fast target's header closure (via hyper_ideal_utility/geometry); all heavy headers (newton_solver, the CGAL entry points, the FD Hessians) are NOT compiled by conformallab_tests. The test-fast failures showed non-deterministic timing (2m21s vs 1m49s) — the signature of an OOM kill in the 800m-limited Pi container, not a code defect. Local: 301/301 CGAL + 26/26 fast green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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