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* test: add SM5 scheduler testsCraig Jennings2026-04-291-0/+337
The SM5 algorithm at org-drill-determine-next-interval-sm5 had no direct test coverage. SM2 has 37 tests. SM5 has zero. Adds a per-function test file that mirrors the SM2 file's structure. 32 tests cover Normal, Boundary, Error, and algorithm-verification categories. The SM5-specific surface gets dedicated coverage. Failure preserves the input EF, not the modified one. The of-matrix is copied, not mutated. The four delta-days configurations (nil, positive, negative-with-flag, negative-without-flag) each take a different code path. The Error category includes should-error cases for the cl-assert preconditions on n and quality, which is a gap SM2's tests still have. All 32 pass on first run as characterization. Full suite at 180 of 180.