apex: clean apex-profile weighting (bench-validated, perf-optimized)#68

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apex-weighting-clean

Commits on Jul 19, 2026

apex: add ApexConfig scaffold (default reproduces main)
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apex: retune base apex profile (cos^0.5*I^0.75, scribe floor 1.75, 1 blur pass, joint-snap 1)
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apex: add ratio-free coelution weight (KEEP: SUM 326.2 -> 341.5, +15.3)
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apex: add cross-row coincidence-vote weight (KEEP: SUM 341.5 -> 405.1, +63.6)
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apex_sim(bench): add absent_precursor scenario
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apex: O(n) median/MAD via select_nth in vote pass (perf: 91->59 us/run)
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apex: O(rows) coelution via ||W||^2 identity + zero-cycle skip (perf: 59->51 us/run)
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apex: reuse per-worker scratch in coelution/vote passes (no per-candidate alloc)
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apex: extract weight passes into scoring/apex module with unit tests
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apex: round weight-strength constants (coel_k 1.0, vote_k 14, tau 1.3, s 0.4)
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apex: iterate profile/m by ref in weight loops (clippy needless_range_loop)
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