test: pin the #286 akm_slopes cell against fake convergence - #397
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The shared_year cell (100k rows, mobility 0.05, tol 1e-12) once drove the Schwarz factor near singular, and the collapsed LSMR recurrences reported it converged at a group-mean error of 18 (#290, #276 wheel). Solved single-threaded, where the collapse reproduces, it must converge with every group mean of the demeaned response below 1e-6.
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Stack 4/7 (test), based on main. Lands the #286/#290 regression cell before the exit rework in #388, so the rework visibly keeps it green.
tests/test_fake_convergence.pysolves the akm_slopes shared_year cell (100k rows, mobility 0.05, tol 1e-12) single-threaded, where the recurrence collapse reproduces, and requiresconvergedwith every group mean of the demeaned response below 1e-6.