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perf: memoize k×s segment-id construction - #364
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The segment ids are static per (grid, s) pair but the partial pre-bin runs once per likelihood evaluation in a fit, and the per-pixel construction loop cost ~60 ms on a realistic 3000-pixel adaptive mask — per evaluation. An lru_cache on the sizes' bytes makes repeat calls ~80 us (x750). The returned array is marked read-only (shared across callers); the divisibility guard fires identically through the cache. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Follow-up to the k×s coupling (#362): the design promised the segment map cached; phase 2 rebuilt it per call — a per-likelihood-evaluation cost in fits.
lru_cacheon the sizes' bytes: first call 62 ms on a realistic 3000-pixel adaptive mask, cached calls 83 µs (×750), returned array read-only, guard behaviour identical. Suite: 863 passed, zero test edits (behaviour-preserving).🤖 Generated with Claude Code